Package upgrades and changes to security

This release contains the following changes:
* Language changes in home page
* Add links to download complete source code from GitHub
* Footer AGPL image and link to download
* Added AGPL license headers to security solution
* Added default admin intro page and search pages for roles and
permissions in security solution
* Added new NuGet component, Bootstrap.Chosen, that makes chosen select
boxes look more bootstrap v3 compatible
* Upgraded NuGet components, Bootstrap, JQueryUI and JQueryValidation