Add HomeActivity and TabBarActivity with stub fragments

HomeActivity hides title bar and GO button starts
  VIPTabBarActivity

VIPTabBarActivity uses a FragmentPagerAdapter and creates
  three dummy tabs. Also has "About" button on ActionBar

TODO:
  - Create Fragment classes for each actual tab
  - Move Fragment classes to separate files
Refactor Home/Ballot fragments to separate classes
Update README with dependencies
Merge pull request #1 from votinginfoproject/feature/app-architecture

Basic App Architecture
Add models, API query class, and buttons to do test queries.
Add comments
Add template for API keys file and notes to README
Merge pull request #3 from flibbertigibbet/feature/add-models

Add models, API query class, and buttons to do test queries.
Add RetroLambda to project and fix use of HomeFragment

App was skipping the use of HomeFragment entirely, called
the HomeActivity onGoButtonPressed directly via the onClick
xml attribute. When using a fragment with activity,
ensure the following:
  - Activity extends android.support.v4.app.FragmentActivity
  - XML fragment definition has the class attribute properly set
  - Your Activity uses the activty xml layout
Add java env setup instructions to README
Add attribution notes to VIPTabBarActivity TabsAdapter class
Move retrolambda plugin to app build.gradle
Add RetroLambda to project and fix use of HomeFragment

App was skipping the use of HomeFragment entirely, called
the HomeActivity onGoButtonPressed directly via the onClick
xml attribute. When using a fragment with activity,
ensure the following:
  - Activity extends android.support.v4.app.FragmentActivity
  - XML fragment definition has the class attribute properly set
  - Your Activity uses the activty xml layout
Move api_keys.xml.template to xmltemplates

Cannot leave in same dir as api_keys.xml because the build fails
due to missing api_keys.xml.template file. So, just put it in a
different dir outside the app source.
Add Address EditText field to retrieve votinginfo data
Remove unused HomeActivity imports
Remove RetroLambda from global build.gradle
Merge pull request #4 from votinginfoproject/feature/home-view-ui

Home View UI (Unstyled)
Add unit testing run configuration to project
Add error handling for API queries