Save bulk operation descriptions
Improved wordings
Merge branch 'master' into feature/save_bulk_operations

Conflicts:
	laterpay/application/Controller/Admin/Pricing.php
	laterpay/assets/js/laterpay-backend-pricing.js
	laterpay/assets/js_src/laterpay-backend-pricing.js
	laterpay/views/backend/pricing.php
Iconized save link
#434 UI pretty much complete
#434. Backmerge with master.
#434. Added bulk operation model, added controllers.
#434. Added forms, added bulk save ajax request into js.
#434. Functional completed.
#434. Minified js updated.
#434. Backmerged with master.
#434. Added documentation. Updated minified pricing tab js.
#434 Updated a few comments
Merge branch 'feature/434_save_bulk_operations' of github.com:laterpay/laterpay-wordpress-plugin into feature/434_save_bulk_operations
#452 Added rouding to calculated sizes
#452 Deleted CSS output so it must always be generated from Stylus
#452 Delegate vendorizing properties to Autoprefixer
#452 More reasonable Gulp settings
#452 Remove vendor files from sources folder
#452 Deleted JS output so it must always be recompiled from source files