Add Crashlytics to project.
Having Crashlytics included on non-debug builds.  Canceling suspended tasks.
Modify how the completion handlers are called and what thread they use.
Fix crasher when River inits to nil.  Adds logging to crash reporting and ensures that the DLog statements are to not be compiled away.
Bump build number.
Move the Crashlytics API key into a user-defined build setting.
Fixed issue where the TSRiverManager’s initial River’s -fetchedDate was not set when the copy was found in the cache.
Added version number to Settings.  Modified and condensed flow of refresh method.
Push omitted Crashlytics API key to GitHub.