Fix text domain formatting added by the addtextdomain task.

Props @GaryJones: https://core.trac.wordpress.org/ticket/21616
Update .jshintrc to not warn for unused parameters.
Add docs to the readme for the potComments option.
Fix the default 'exclude' value in the readme.
Merge branch 'addtd-format' into develop
Bump to version 0.4.4