Various additions/fixes

- Add FriendList type:
  http://code.google.com/p/restfb/issues/detail?id=191
- Add Venue$getZip:
  http://code.google.com/p/restfb/issues/detail?id=193
- Add a way to extend an OAuth token:
  http://code.google.com/p/restfb/issues/detail?id=187
- Add TestAccount type (for FB application test accounts):
  https://developers.facebook.com/docs/test_users/
- Add Place type, and entry in Photo to access it.
- Add a getTags() method for Checkin objects.
Merge pull request #9 from ex-nerd/master

Various additions
Some cleanups for pull request #9.
More javadoc + deprecation cleanup.
Suppress deprecation warnings in GraphReaderExample.
Lots of type changes. Closes out Google Code issues 164 (Addition of
"with_tags" in Post object), 173 (Add getTags method to CheckIn class),
190 (getFrom on comment should return CategorizedFacebookType), 198 (Add
support for Page#about), 200 (Support for recently added
is_eligible_promo field in User.class), and 201 (Facebook API changing
names of properties).
Added support for Question and QuestionOption graph objects. Fixes #170
(Add support for the question type.)
Fix for #186 (Unable to Map User.class to Json).
Fix for #176 (Unparseable CreateTime).
Question now extends from FacebookType.
Fix for #177 (apprequests) - added AppRequest type.
Updated changelog to include credit to egor@technoparkcorp.com.
Fix for #199 (getting start_time or end_time from event returns null if
the date is of the format yyyy-MM-dd).
Formatting fixes to make upcoming diffs simpler to read.
Some DateUtils cleanup.
Cleaning up FacebookClient.obtainAppAccessToken(String appId, String
appSecret) - documented and added to FacebookClient interface.  Added a
new FacebookResponseContentException which will be thrown in these
parse-response-body-by-hand situations when they go south.
Added Mike Champion to the thank-you list in CHANGELOG.
Finalized support for extending existing access tokens.
Javadoc and formatting fixes.
Fix for #163 (DefaultFacebookClient#parseAccessToken() would be nice to
have).