Add support for TLS 1.2 on API 16+

…nces

…o getForMobileKeys, added multi-environment support to setOffline and setOnlineStatus (seems naive, needs testing), and added exceptions to LDConfig setSecondaryMobileKeys

…fecting all instances.

…fixed some linter issues

…fy method for multi-environment, not sure about SettableFuture null vs null for return type of Future<Void>, both type check and pass tests

…maryKey separation everywhere but the builder. Add getRequestBuilderFor a specific environment. Add static method to LDClient to get all environment names so that environments can be iterated over. Add accessor to retrieve LDClient specific UserManager. Iterate over all environments in PollingUpdater. Add environment argument to UserManager constructor, removing singleton and creating replacing init with newInstance static method.

…Manager may not be able to do the same so removed the environment from the constructor.

…imaryInstance null when offline in init, fixed primaryEnvironmentName being added to secondaryMobileKeys

… authorization header key.

… of LDClient.

…y cleared once all environments have a copy in LDClient

Circlecimigrate

…ersion, replaced with method that returns requested instance

Relates to #60

Cleaned up timber logging messages to use string formatting rather than concatenation. Log messages should remain the same as before.
Also replaced Log with Timber in the example app.

Added version and flagVersion retrieval from ping events if available

Fix crash when example app is backgrounded twice.

…next-release

attempt a provider update when TLSv1.2 is not available.

* fix(SharedPreferences): added more SharedPreferences first time migration and differentiated SharedPreferences by mobile key

* fix(UserLocalSharePreference.java): added missing mobileKey additions to getSharedPreferences, cleaned up debugging code

…er instantiation in unit test

preferences migration to make future migrations easier.