add deploy target to makefile, removed old test targets

Hey @justinsainton check this one out when you get a chance, and feel free to merge. Curious to see if the script works for you without errors.

Basically it adds a `make deploy` command that will ask you for a tag to push to the WordPress Plugin Directory SVN repository, and it'll do all of the merge and pulling things from that tag automatically. It requires the tag be pushed to GitHub first just as a sanity check.