Paginate to get all of the PR comments

PR comments are returned 30 at a time. If a PR has a lot of comments then we
will generate duplicate comments, because we're not looking at all the comments.
This fix will fetch all the comments for us by paginating until the end.

* refactor the pagination to apply for user repos, org repos and comments
Add well-known JS variables to be ignored

There are some well known global variables that cause JSHint warnings. We should
add them to the list of ignored variables.

* ignore jquery variables
* ignore angular variables
* ignore jasmine variables
* sort the JSHint options
* combine ignored varibales from both configs
* move active_support test dependency into fast_spec_helper

https://trello.com/c/1kUi8THW
[WIP] docs