Fixed manipulation of branch/tag name
- Complete rewrite of mpinstaller
  - Run actual installation in background via Heroku worker
  - Separate beta and prod pages
  - Split out logic for mdapi interaction
  - Require username to match connected org in order to install
  - Track all install status in db and display via installation_overview
- Initial setup of Foundation branding
Merge pull request #2 from SalesforceFoundation/mpinstall_refactor

Refactoring of Managed Package Installer (mpinstaller)