Latest getglue-java snapshot with renamed manager, static request builders.
Add GetGlueSettings to store OAuth 2.0 tokens.
Built in new GetGlue authentication and token retrieval.
Move GetGlue checkin to getglue-java. Still incomplete.

- Remove unused code, remove signpost lib, move credentials clearer to
GetGlueSettings.
- Rename GetGlue to GetGlueCheckin.
Clean up.
Move check-ins to new GetGlueCheckin and GetGlueSettings.

- For shows need to ask the user for a GetGlue id at first check-in, for
movies rely on the first search result.