Update docs for 1.2a release
Update docs for 1.2a release

Labeling this one as "alpha" because it is still pretty rough
and raw, but seeing as the code is on the master branch and
most people are following master (due to the way the Vim
plug-in ecosystem operates), may as well draw a line in the
sand to say this is close to what I want to "release".

wincent/ferret