add Zend\Db\Sql\Ddl\Column\Text to allow TEXT specification
change classname for TextTest.php
remove $length docblock
Merging PR #4500
Merge branch 'samsonasik-add/ddl.columnBigInt'
Merge PR #4468
Merge branch 'add/ddl.columntext' of git://github.com/samsonasik/zf2 into samsonasik-add/ddl.columntext
Foward #4468
Merge branch 'samsonasik-add/ddl.columntext' into develop