Bump version to 2.7.0.rc3
Builds 2.7-stable branch on travis
Adds new Alchemy.Spinner.watch function for links with '.spinner' class.

And adds the spinner class to sitemap folder toggle link.
Fixes false icon in resources tables
Reverting back to globally require everything in Alchemy boot process. :(

This breaks to much stuff.
Maybe in Rails 4 (Alchemy 3.0) we can change the dependency loading mechanism to eager autoloading.
Fixes a bug in `elements#update,js`, where elements with EssenceSelects become unsavable.
Abort if devise encryptable module is enabled, but not installed.
Throw 404 if attachment can not be found.
Fixes deploy script templates db:seed task.
Require `alchemy/version` in dashboard controller.