Fix the slowness experienced with ,a & ,t.

@matthewtodd @rudle @strongriley 

tl;dr: this speeds up `,a` and `,t` by removing conflicting mappings.

The Align plugin comes with AlignMaps which adds a bunch of mappings for special kinds of alignments. I never use these and I don't know if anyone else does. This wouldn't be a problem except that many of them begin with `,a` or `,t`, which forces vim to wait to make sure you really meant `,a` and `,t` when you type them before running the associated command. This makes those commands appear to be slow. My solution is to run `AlignMapsClean` if the plugin has been loaded when vim starts up. This has the effect of removing the AlignMaps plugin from the Align plugin so that the *next* time you start vim the commands will be fast. First-time users would see slowness with `,a` and `,t` the first time they launch vim using maximum-awesome.