OAuth2 client should allow  setting only a refresh token.
Incr package version.
Merge pull request #53 from burcu/no-token-fix

OAuth2Client shouldn't throw access token error until attempting to refresh
Requests should not take query params as the first parameter.
Merge pull request #56 from burcu/paramfix

Requests should not take query params as the first parameter
Parameters should be optional.
Better looking test results and more time to live.
Releasing 0.2.13.
Merge pull request #58 from burcu/fix-param-order

Query params should be optional if method doesn't require any params
Added public method to retrieve access token from refresh token.
Updated method name
Merge pull request #60 from bentona/master

There should be a public method to retrieve a new access token from refresh token