Revert "Use latest Retrofit"

This reverts commit a86e4733f4758223fdf772561e3b6787d6000cdf.
Rename `ReleaseResult` to `Releases´.

- Naming more in line with other entities.
Merge branch 'chrisbanes-dev' into dev
Use retrofit 1.4.1.
Move deps and example into README file.

- Dropped website.
Dev branch should create snapshot releases.
Make this 0.3.0.
Add new Configuration properties.
Change log for 0.3.0.
Specify version of maven-source-plugin.
Merge branch 'release-0.3.0' into dev
Start next dev cycle.
Use secure endpoints.
Use `setEndpoint` instead of deprecated `setServer`.

- See https://github.com/square/retrofit/blob/master/CHANGELOG.md.