Merge pull request #114 from robmorgan/0.2.x-dev

Merge into Master
Merge branch 'master' of github.com:robmorgan/phinx
Merge branch '0.2.x-dev'
Merge branch '0.2.x-dev'
Merge branch 'master' of https://github.com/felipedjinn/phinx into 0.2.x-dev
Add support to column comments in MySQL Adapter