Fixed so that you can pass in database group to the migrate command line

Not perfect and there seem to be about 3 different ways of getting a database conection

Will need to be worked on to get that under control
Add config option to hard prevent migrations before a certain date from running
Fix bad variable call, Fixes #15
Fix bug where migrations to +/- would not work properly. Fixes #16
Merge remote branch 'firstclown/develop' into 3.2/develop