Replace follow question by "want answers"
handle check_activity for upvote and want answers

Create two new helper functions, username_correspond and want_answers.

username_correspond extract the user's username from Quora's rss endpoint (http://www.quora.com/<username/rss) and the author of the answer upvoted / written. If the username correspond it means that the entry is an answer written by the user else it is an upvoted answer.

want_answers check for the pattern # Answer(s) in the item's description.
First version of check_activity + new helpers + merged follows and want_anwers

check_activity is now given the entire entry and make use of three new helper functions:

* is_author(link, baseurl): check if the user is author of the answer or only upvoted it.
* is_review(link): check if the user is asking for a review
* want_answers(description): check if the user is "wanting an answer" i.e "follow a question".

I decided to split the BeautifulSoup casting in two parts to preserve variable immutability / clarity.

The exception checking in my helpers function is a bit messy, I will need to double check/test that. 

I merged follows and want_answers because there is no way to distinguish them from one another and Quora decided to strip users from their ownerships of questions.
Cleanup if/elif/else structure
init commit for unit testing of check_activity
correct function's name
Corrected syntax errors + casting problems + tested for production

Code have been tested and everything should work fine. Of course additional tests and scrutiny is welcomed!
remove local file
Merge pull request #11 from aaronwinter/patch-1

Fix #10 check_activity