Decoupled access token handling
Merge pull request #129 from SammyK/decouple-access-token-handling

Decoupled access token handling
* Use a cryptographically secure pseudorandom number generator. Now with
tests.
Merge pull request #133 from sarciszewski/csprng2

Implement CSPRNG in a manner consistent with the feedback on #131
Added autoloader for those poor non-composer peeps
Merge pull request #135 from SammyK/autoloader-for-non-composer-peeps

Added autoloader for those poor non-composer peeps