Release package: Improved logic & flow in the function that actually performs the release. Added ability to specify git branch from the settings file, defaults to master.
DB functionality: added ability to specify a "stashed" file's name (not full path, the file must be located in the archive directory specified in the settings file). By default, it looks for a file in the archive directory named something like `myproject.local.stash.sql`, and now you can name any file you want (well, any file in that archive directory), for example:

    fab db.unstash:local,myproject.dump.123456.sql

That would insert that file into the database. This could be very useful for rolling back the database to a previous dump.
Adding `git_branch` option.
updated changelog.