Merge Reader and Writer entities

Merged Cell/Row/Style entities

src/Spout/Writer/Exception/Border/InvalidNameException.php

@@ -2,7 +2,7 @@
 
 namespace Box\Spout\Writer\Exception\Border;
 
-use Box\Spout\Writer\Common\Entity\Style\BorderPart;
+use Box\Spout\Common\Entity\Style\BorderPart;
 use Box\Spout\Writer\Exception\WriterException;
 
 class InvalidNameException extends WriterException

src/Spout/Writer/Exception/Border/InvalidStyleException.php

@@ -2,7 +2,7 @@
 
 namespace Box\Spout\Writer\Exception\Border;
 
-use Box\Spout\Writer\Common\Entity\Style\BorderPart;
+use Box\Spout\Common\Entity\Style\BorderPart;
 use Box\Spout\Writer\Exception\WriterException;
 
 class InvalidStyleException extends WriterException

src/Spout/Writer/Exception/Border/InvalidWidthException.php

@@ -2,7 +2,7 @@
 
 namespace Box\Spout\Writer\Exception\Border;
 
-use Box\Spout\Writer\Common\Entity\Style\BorderPart;
+use Box\Spout\Common\Entity\Style\BorderPart;
 use Box\Spout\Writer\Exception\WriterException;
 
 class InvalidWidthException extends WriterException

src/Spout/Writer/Exception/InvalidColorException.php

@@ -1,10 +0,0 @@
-<?php
-
-namespace Box\Spout\Writer\Exception;
-
-/**
- * Class InvalidColorException
- */
-class InvalidColorException extends WriterException
-{
-}