Split the Landing page into a tabbed interface

The landing page has been split up, and slightly dressed up, into a 3-tab interface. During inital testing, things are looking good. I still need to complete the testing on the device against a "real" group to verify that the sync and upload functionality is still functional.
a few final tweaks to the new landing page
Merge pull request #642 from Tangerine-Community/SplitAppHomepage

Split the Landing page into a tabbed interface