Add start of Repos/Stats module

This doesn't yet implement all endpoints, but it is a start at least
Add contributors section.
Make the sleep optional

This commit introduces the optional argument `wait_for_200`, which will cause
contributors to keep trying until it gets a response that is not 202.

Other suggestions for argument name might be:

* auto_wait
* wait_for
* auto_202_sleep

Not sure which one (if any) I actually like.
Merge pull request #152 from omega/repos-stats

Add start of Repos/Stats module
Update Changes.
Gists now have another number in their comment urls
plu is a member of a new org now :P
Update git_data test to new data

* The old blob test was fetching a commit, so changed that to a blob.
* Dates are now returned in Z timezone, changed that
* Message is now chomp'ed
* added html_url to the two places the API now returns it.
Update live repos test to new data

* Dateformat changed to Z timezone
* donwload urls point to API now
GET / now returns pointers to other endpoints

* changed from 204 -> 200
* udpated expected result
Merge pull request #153 from plu/update-live-tests

Update live tests
v0.01020

          - Add Pithub::Repos::Stats->contributors
            (Andreas Marienborg)
Add Repos::Statuses api
Update Changes
Merge pull request #155 from plu/statuses

Add Repos::Statuses api
Use ReadmeAnyFromPod to generate readme.
Add readme to be more Github friendly.
v0.01021

          - Add Pithub::Repos::Statuses->list and ->create
            (Andreas Marienborg)
Merge branch 'master' of github.com:plu/Pithub
Fix typo.