Added helpers to super service. Added setter for default access token.
Added access to GraphList meta data
Improved exception handling
Added more secure peer verification
Refactored signed request handling
Merge pull request #284 from SammyK/helpers-from-super-service

[4.1] Added helpers to super service. Added setter for default access token.
Merge pull request #285 from SammyK/add-access-to-graph-list-meta-data

[4.1] Added access to GraphList meta data
Merge pull request #286 from SammyK/improved-exception-handling

[4.1] Improved exception handling
Merge pull request #283 from SammyK/more-secure-peer-verification

[4.1] Added more secure peer verification
Merge pull request #288 from SammyK/refactor-signed-request

[4.1] Refactored signed request handling
Fixed conflicts