MySQL connection dsn, charset support

 - added charset support for MySQL dsn string
 - added charset parameter to the phinx configuration
 - updated configuration documentation
Fix for PSR-2
Update documentation. (Some little documentation for #146)
Documentation for configuration file features added in #60.
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
CGIV-1055 fixed composer.json package name
adding scrutinizer support
add code coverage badge
escape underscores