Map View

Summary:
* adds map only view

* renames post to post-list

Test Plan:
* click 'views/map' to check map view load
* click the logo and title to see post list view
* click 'views/list' to see post list view

Reviewers: rjmackay, shadowhand

Reviewed By: shadowhand

Subscribers: spaudanjo, sebm90, digitalafrican, eyedol, lkamau, srutto, dkobia, rjmackay

Differential Revision: https://phabricator.ushahidi.com/D458