Refactor error handling

[samtstern]

Went through and looked at all error handling that uses TaskFailureLogger to ensure that each case has some sensible error handling beyond logging. In most cases I split onCompleteListener into separate onSuccessListener and onFailureListeners.

Also fixed a crash that can come from repeated uses of GoogleApiClientTaskHelper.

This addresses the following issues:

• Audit uses of TaskFailureLogger #257
• Multiple Google Sign In / Sign Out attempts in same Activity causes crash #287

[samtstern]

@amandle PTAL, this is a somewhat large refactor (although not much new logic, still room for errors)

[amandle]

@samtstern LGTM!