Add ResponseCallback class
Merge pull request #352 from atermenji/response_callback

Add ResponseCallback class
Fix VerifyError when using mock REST adapter without RxJava.
Add sample which uses mock data.
Merge pull request #356 from square/jw/fix-broken-mock

Mock fixes and an example.
fixed javadoc
Merge pull request #357 from jdreesen/patch-1

fixed javadoc
Prepare for 1.3.0.
[maven-release-plugin] prepare release parent-1.3.0
[maven-release-plugin] prepare for next development iteration
Gson customization docs

Added a Gson customization section to the website
Added blurb about GSON documentation
Fix identation in Gson customization docs; emphasis that Retrofit just offloads to Gson for custom conversion behavior
move usages of Observable out of RestMethodInfo

Moving them into a nested class should prevent Dalvik from trying to
load the class when it's not needed.
Check for extended interfaces using getInterfaces().length instead of getSuperclass()
Fix extending interface test to actually fail.
Merge pull request #365 from square/loganj/more_indirection

move usages of Observable out of RestMethodInfo
Update custom conversion docs per feedback

* Clarify that Gson is just the default converter
* Add section on other built-in converters
* Add section on implementing your own custom converters
Fix small wording issues in custom converter docs
Merge pull request #359 from swanson/gson-customization-docs

Gson customization docs