Loomio beta

Ready for Code review 
@robguthrie 
Ready for QA
@s01us 

- adds loomio beta logo to all users except those who belong to a manual_subscription group
- renames user_settings to profile
- update navbar, dropdowns, header breadcrumbs
- remove contribution link, settings
- update all icons
- add find a group for logged in users in group dropdown

QA Results
 :white_check_mark: Loomio beta logo on logged out view and on pages for groups with undetermined payment plan
:white_check_mark: User settings successfully renamed to profile
:white_check_mark: No visible reference to payment options
:white_check_mark: Icons look sweet!
:white_check_mark: Groups dropdown looks good - links functional