Merge pull request #5 from srautiai/master

Added options to start test run with device ids
Merge pull request #7 from srautiai/master

Added device list query, list_all method for list resources
Merge pull request #8 from srautiai/master

Added device sessions
Merge pull request #9 from srautiai/master

Refresh token if it is expired
Merge pull request #10 from srautiai/master

Fixed token expiry check
 User customer header when fetching a new token
Merge branch 'master' of github.com:bitbar/testdroid-api-client-ruby