Update intelligent dropdown and pillbox to use it

Also make pillbox more Bootstrap-ish with styles syntax
Remove forceUp method due to presence of BS's drop up class
more explicit css
Update Pillbox and dropdownup

- Increase clarity of pillbox variables
- Update unit tests
- rename intelligent-dropdown to dropdownup
- convert to tabs
dropdownup ternary to if statement
Merge pull request #485 from ExactTarget/update-intelligent-dropdown

Update intelligent dropdown and pillbox