Add support for releases endpoint

[bmulvihill]

Closes #125

Adds support for /releases
https://www.pivotaltracker.com/help/api/rest/v5#Releases

One caveat is I am unsure how to get the test data for VCR to write the tests.

[coveralls]

Coverage increased (+0.1%) to 97.077% when pulling 405311e on bmulvihill:releases into 72c51d3 on dashofcode:master.

[forest]

@bmulvihill for releases you can will want to add a test for Stories#get_release and Project#releases. I think it makes sense to add the tests to the respective test files that already exist. You will see from the existing tests, like for Story#tasks that VCR.use_cassette is used to wrap the parts that make API calls. https://github.com/dashofcode/tracker_api/blob/master/test/story_test.rb#L212

VCR will record the API call and save the response. Then in subsequent test runs it will return this saved response instead of actually making the API call. To get VCR to re-record the response just delete the file with the response and it will be recreated.

When you are happy with the reponse add it to git.

[bmulvihill]

@forest I guess my main question with the tests were which project board you using to create the test data? Or is this already handled via some configuration?

[bmulvihill]

Just answered my own question :)
https://github.com/dashofcode/tracker_api/blob/master/test/minitest_helper.rb#L19-L31

[forest]

Ah. The project has three for different use cases but I typically use #1.
https://github.com/dashofcode/tracker_api/blob/master/test/minitest_helper.rb#L28

You might have to login and create from releases so you have some data to query.

[forest]

👍 Looks good.