CYB-340 Comment on own gallery item should NOT score points for giving or receiving

* Comparison was being made between different data types; the poster's id on the parent
   item was an integer (Fixnum) but the current_user.canvas_id was a String.
  Calling '#to_s' on both, if later current_user.canvas_id is refactored to return an Integer,
   this will make sure that even if this code is missed, it will still work correctly.  #to_s
   on a String just returns self.

https://jira.ets.berkeley.edu/jira/browse/CYB-340
CYB-377 Youtube URLs are not always https

* changed the regular expression where it matched the protocol to always match
    http:// or https://
* This will ensure that Youtube videos are handled as such.

https://jira.ets.berkeley.edu/jira/browse/CYB-377
CYB-379 - thumbnail_default.svg - convert tabs to spaces and remove unused layers

https://jira.ets.berkeley.edu/jira/browse/CYB-379
Merge pull request #232 from coyote/compare_like_types_in_comments_controller

Comment on own gallery item should NOT score points for giving or receiving
CYB-367 - Further debugging
CYB-375 The date is no longer returned in the /gallery/index feed

 * adding the 3 date fields that are taken from the Canvas API return values
   for each asset type to the selected values returned

https://jira.ets.berkeley.edu/jira/browse/CYB-375
Merge branch 'add_date_to_gallery_index_feed' of https://github.com/coyote/datacultures into add_date_to_gallery_index_feed
CYB-374 - Sort on the correct property when sorting by date
Merge pull request #234 from nicolaasmatthijs/CYB-374

CYB-374 - Sorting by date is showing the oldest items first
Merge branch 'match_youtube_http_not_s' of https://github.com/coyote/datacultures into match_youtube_http_not_s
Merge branch 'master' of https://github.com/ets-berkeley-edu/datacultures into match_youtube_http_not_s
CYB-377 - Whitespace fix
Merge branch 'CYB-379' of https://github.com/christianv/datacultures into CYB-379
Merge branch 'master' into CYB-367