Add general method for using session CSRF token.
Add CSRF protection for files, items, collections
Add CSRF protection to plugins actions.
Kill notice in ElementForm on incomplete POSTs.
Use "token" instead of "hash"
Fix display of Csrf quasi-form
Fix tests for now-protected forms
Switch to session-based csrf form for manual use
Remove unused tag actions.
Token-ize the bulk of remaining admin actions

Covers element-sets, item-types, settings (api, search,
item-type-elements).
Token-ize tags ajax action.
Loosen timeouts on per-page tokens.
Use deletion popup for element sets.
Fix extra spacing on collections pagination.
Add ID support to collection shortcode.
Bump version to 2.2.2.
Add version info for new csrf helper components
Pull from Transifex.
Upate bundled plugins.
Update .travis.yml

Adds additional stable PHP versions to Travis CI tests