Add FragmentHostActivity and SupportFragmentHostActivity to OAK with demos.
Modifed ObscuredSharedPreferences to use a random initialization vector.
Created new CryptoSharedPreferences and deprecated existing ObscuredSharedPreferences.
Modified documentation to reflect new CryptoSharedPreferences wrapper.  Modified css a bit as well.
Added fix for PRNG not being good at random number generation.  Also made fragment host key strings public.
Move PRNGFixes.apply() to Application.onCreate() in demo.
Update archetypes for new CryptoSharedPrefs
Merge fragdevhost branch