Linkify Github usernames in authors list

- Linkify github usernames
- Remove usernames that do not exist

Change-Id: Ib88b70a3010e915b3570ae5062c8cb416c9a6462
Add links to Twitter accounts

Change-Id: Ic88eb128384b3cc9108151c219cd759c7524a4f1
Upgrade urllib3 to 1.9.x
Fix test bug courtesy of @shazow
Merge pull request #2140 from dpursehouse/linkify-usernames

Linkify Github usernames in authors list
Update faq.rst

Removed an unnecessary "to" in the "What are "hostname doesn't match" errors?" section.
Update faq.rst

Revised wording based on feedback from @sigmavirus24
Merge pull request #2145 from TkTech/patch-1

Update faq.rst
Merge pull request #2142 from sigmavirus24/urllib3-1.9

Upgrade urllib3 to 1.9.x
Handle socket errors in iter_content
Replace setattr
Merge pull request #2148 from romanlevin/handle-socket-error-in-iter_content

Handle socket errors in iter_content
handle urllib3 api changes; closes #2045
Merge pull request #2153 from jschneier/master

handle urllib3 api changes; closes #2045
Tracking Previous Requests

Addresses the issue brought up here:
https://github.com/kennethreitz/requests/issues/1929
21m
Update on Tracking Previous Requests

Modified the comment in sessions.py and rewrote the test in
test_requests.py
Merge pull request #2168 from ContinuousFunction/master

Tracking Previous Requests
Added space and sentence case

Added space and sentence case as requested by sigmavirus24.
https://github.com/kennethreitz/requests/pull/2168
Adding my name to authors.