Moved readers to iterators

Instead of the hasNext() / next() syntax, readers now implements the PHP iterator pattern.
It allows readers to be used with a foreach() loop.

All readers now share the same structure (CSV is treated as having exactly one sheet):
- one concrete Reader
- one SheetIterator, exposed by the Reader
- one or more Sheets, returned at every iteration
- one RowIterator, exposed by the Sheet

Introducing the concept of sheets for CSV may be kind of confusing but it makes Spout way more consistent.
Also, this confusion may be resolved by creating a wrapper around the readers if needed.

-- This commit does not delete the old files, not change the folder structure for Writers. This will be done in another commit.

tests/Spout/Reader/XLSX/Helper/SharedStringsCaching/CachingStrategyFactoryTest.php

@@ -0,0 +1,99 @@
+<?php
+
+namespace Box\Spout\Reader\XLSX\Helper\SharedStringsCaching;
+
+/**
+ * Class CachingStrategyFactoryTest
+ *
+ * @package Box\Spout\Reader\XLSX\Helper\SharedStringsCaching
+ */
+class CachingStrategyFactoryTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @return array
+     */
+    public function dataProviderForTestGetBestCachingStrategy()
+    {
+        return [
+            [CachingStrategyFactory::MAX_NUM_STRINGS_PER_TEMP_FILE, -1, 'FileBasedStrategy'],
+            [CachingStrategyFactory::MAX_NUM_STRINGS_PER_TEMP_FILE + 10, -1, 'FileBasedStrategy'],
+            [CachingStrategyFactory::MAX_NUM_STRINGS_PER_TEMP_FILE - 10, -1, 'InMemoryStrategy'],
+            [10 , CachingStrategyFactory::AMOUNT_MEMORY_NEEDED_PER_STRING_IN_KB * 10, 'FileBasedStrategy'],
+            [15, CachingStrategyFactory::AMOUNT_MEMORY_NEEDED_PER_STRING_IN_KB * 10, 'FileBasedStrategy'],
+            [5 , CachingStrategyFactory::AMOUNT_MEMORY_NEEDED_PER_STRING_IN_KB * 10, 'InMemoryStrategy'],
+        ];
+    }
+
+    /**
+     * @dataProvider dataProviderForTestGetBestCachingStrategy
+     *
+     * @param int $sharedStringsUniqueCount
+     * @param int $memoryLimitInKB
+     * @param string $expectedStrategyClassName
+     * @return void
+     */
+    public function testGetBestCachingStrategy($sharedStringsUniqueCount, $memoryLimitInKB, $expectedStrategyClassName)
+    {
+        /** @var CachingStrategyFactory|\PHPUnit_Framework_MockObject_MockObject $factoryStub */
+        $factoryStub = $this
+            ->getMockBuilder('\Box\Spout\Reader\XLSX\Helper\SharedStringsCaching\CachingStrategyFactory')
+            ->disableOriginalConstructor()
+            ->setMethods(['getMemoryLimitInKB'])
+            ->getMock();
+
+        $factoryStub->method('getMemoryLimitInKB')->willReturn($memoryLimitInKB);
+
+        \ReflectionHelper::setStaticValue('\Box\Spout\Reader\XLSX\Helper\SharedStringsCaching\CachingStrategyFactory', 'instance', $factoryStub);
+
+        $strategy = $factoryStub->getBestCachingStrategy($sharedStringsUniqueCount, null);
+
+        $fullExpectedStrategyClassName = 'Box\Spout\Reader\XLSX\Helper\SharedStringsCaching\\' . $expectedStrategyClassName;
+        $this->assertEquals($fullExpectedStrategyClassName, get_class($strategy));
+
+        $strategy->clearCache();
+        \ReflectionHelper::reset();
+    }
+
+    /**
+     * @return array
+     */
+    public function dataProviderForTestGetMemoryLimitInKB()
+    {
+        return [
+            ['-1', -1],
+            ['invalid', -1],
+            ['1024B', 1],
+            ['128K', 128],
+            ['256KB', 256],
+            ['512M', 512 * 1024],
+            ['2MB', 2 * 1024],
+            ['1G', 1 * 1024 * 1024],
+            ['10GB', 10 * 1024 * 1024],
+            ['2T', 2 * 1024 * 1024 * 1024],
+            ['5TB', 5 * 1024 * 1024 * 1024],
+        ];
+    }
+
+    /**
+     * @dataProvider dataProviderForTestGetMemoryLimitInKB
+     *
+     * @param string $memoryLimitFormatted
+     * @param float $expectedMemoryLimitInKB
+     * @return void
+     */
+    public function testGetMemoryLimitInKB($memoryLimitFormatted, $expectedMemoryLimitInKB)
+    {
+        /** @var CachingStrategyFactory|\PHPUnit_Framework_MockObject_MockObject $factoryStub */
+        $factoryStub = $this
+            ->getMockBuilder('\Box\Spout\Reader\XLSX\Helper\SharedStringsCaching\CachingStrategyFactory')
+            ->disableOriginalConstructor()
+            ->setMethods(['getMemoryLimitFromIni'])
+            ->getMock();
+
+        $factoryStub->method('getMemoryLimitFromIni')->willReturn($memoryLimitFormatted);
+
+        $memoryLimitInKB = \ReflectionHelper::callMethodOnObject($factoryStub, 'getMemoryLimitInKB');
+
+        $this->assertEquals($expectedMemoryLimitInKB, $memoryLimitInKB);
+    }
+}