Restructure messages and tools SCSS files
Add data provider list and config

- Pass dummy models to the view
- Generate backbone form based on data provider 'form' attribute
* moved `.actions-bar` into `partials`
* message config `action-bar` styling

Styling data provider config
* data provider card/message sources
* Data Provider Tab Nav
* individual providers config template
* Data Provider Selected States
* hardcodes DataProviderConfigSms
Hide new ui hidden behind feature config
Add data provider listing and config

Summary:
- Restructure messages and tools SCSS files
- Add data provider list and config
- Using dummy models to power views
- Generate backbone form based on data provider 'form' attribute
- Styling data provider config
  * data provider card/message sources
  * Data Provider Tab Nav
  * individual providers config template
  * Data Provider Selected States
  * hardcodes DataProviderConfigSms
- Hide new ui hidden behind feature config

Test Plan: None yet

Differential Revision: https://phabricator.ushahidi.com/D127
Data provider item clean up

- Remove 'pointer' cursor from entire data provider items
- Avoid duplication of data provider items
- Use <a> for provider buttons
Move repeated bits of message config views in DataProviderLayout

Hiding the tab nav for now.