Added signed variable to mysql table
removed stray semicolon
corrected testAddStringColumnWithSiqngedEqualsFalse test
restructured tests so expected & actual are the correct way around
auto_increment field option on columns
Merge branch 'auto_increment_fields' into CG

Conflicts:
	src/Phinx/Db/Table/Column.php
	tests/Phinx/Db/Adapter/MysqlAdapterTest.php
revised mysql adapter test
removed save from test
added primary key to auto increment id test
revised auto increment test to check correct fields
revised auto increment id to assert equals
Merge branch 'auto_increment_fields' into CG