Added Requirements document
Set up basic testing framework
Modified scan_comments to make it more testable, wrote tests for scan_comments.
Modified scan_comments to make it more testable, wrote tests for scan_comments.
Created praw_mocks module to keep mocks and test cases separate.
Wrote tests for scan_comments and the methods that it uses.
Added runtests script
Merge pull request #45 from chrisuehlinger/master

First round of testing