feat(textAngular) change serial to allow it to be set manually

Allows you to set the post-fix of the generated html and text editors of text angular.

Closes #175
chore(README) Fix notes about sanitize modules

chore(README) Fix notes about sanitize modules

There was confusion about `textAngular-sanitize.js` vs `angular-sanitize.js` hopefully this should be cleared up now.
Merge branch 'master' into #132-tooltip