Reorganise directory structure.

Remember PYTHONPATH="." can help.
Some tests now pass.
StackExchange API v2 now returns "safe" content

Unescape appropriately for matching - code cribbed from
http://stackoverflow.com/a/449169/928098
Answer.title no longer included by default; dropped from __unicode__()
Merge pull request #12 from doismellburning/html_unescaping

Html unescaping
Merge pull request #13 from doismellburning/answer_title_not_default

Answer.title no longer included by default; dropped from __unicode__()
Backport the throttling fix from master.
Rewrite old body, comments, answers params as filters.
Fix slight typo in previous commit.
Get StackAuth working to a certain degree.
Fix 'Experience' demo.
Don't be so miserly about situations where we rewrite body, etc. params
Fix result set creation/pagination for v2.x
URL formatting assumed option values were strings.

They are now coerced explicitly.
Fix rate limiting attribute compatibility

Also some minor fixups to core code.
Update StackAuth significantly for v2.0.
Fix remaining failures and add a couple of StackAuth test cases.
'total' resultset field removed; fix search demo
Actual fix for search.py demo.
Add overview of API fields and methods