Remove references to Bugzilla

Replace any such references with references to GitHub, as appropriate.
Leave "dw-bugzilla@" email addresses alone.
Remove last bugs.dwscoalition.org references

Fixes #663. Both the references here removed were links to further docs
of what had been done, rather than notices about outstanding bugs, in
any case.
Actually fixes #663

Add a temporary explanatory note about the broken link to the CLA, and
what to do about it.
Change names of updates strings

Avoid later trouble in this way.  Simply append "2" in two places, in
each of two files, to fix commit before last.
(Issue #691) Hide 'track thread' icon from free users

Checks whether a user can track threads before displaying tracking icon.
(Issue #661) Allow People with Siteadmin Priv to PM Uncomfirmed Accounts

Allows somebody to PM an unvalidated account (unconfirmed email address)
if they have the siteadmin:* priv. Fixes #661.
Merge pull request #704 from hotlevel4/bug661/PMUnverifiedAccounts

(Issue #661) Allow People with Siteadmin Priv to PM Uncomfirmed Accounts
Merge pull request #703 from hotlevel4/bug691/hideTrackButton

(Issue #691) Hide 'track thread' icon from free users
Display poster column only when relevant

* in members/new, only show the poster column if the community post
  level is "select", instead of always showing (that was left over from
  when you could always revoke poster access, even if the post level was
  "all")

* in members/edit, always show the poster column if anyone has "posting
  access" set on them (this makes it act the same as
  unmoderated/moderator columns). This is a bit of an edge case, caused
  when someone switches community settings, but their community members
  used to have posting access explicitly -- this meant that the members
  would still show up on the "edit community members" page, because they
  still had an edge connected to the community, but there might not be a
  checkbox to uncheck
Merge pull request #705 from afuna/handle-poster-column

Display poster column only when relevant
Merge pull request #698 from Darael/bug663-bz-to-ghi

Fix #663 - Bugzilla to GitHub Issues migration
Issue #672 - Respect 12 hour time preference in site scheme

Fixes a bug where viewing one's own journal in site scheme did not respect
12 hour time preference and would display 24 hour time. Fixes #672.
Merge pull request #708 from hotlevel4/bug672/Respect12HrTime

Issue #672 - Respect 12 hour time preference in site scheme
Remove debug code
Explicitly detect `isremote` for the journalselect event

(And do so only when we're "posting as other")

We'd assumed that a change on #postas_usejournal or #post_username would
only be triggered if a user selected "post as other", therefore isremote
would automatically be false.

However, Chrome started firing a change event on #post_username even
without user input (perhaps to do with autocomplete?). So now we
explicitly check the current remote against the username of the user
we're posting as..

But we can't just compare postas_usejournal to postas_remote because
they could be different because of autocomplete. So we also make sure
that all this only happens when the "post as other" radio box is
selected

Fixes 709.
Hide/show icon component even when there are no icons

Move the hiding/showing of the icon component to above the checks for
whether the user has icons or not. That way, when someone is doing a
"post as other", they don't have an irrelevant "upload icons" link
staring at them
Merge pull request #711 from afuna/update-page-chrome-bug-709

Fix icon/crosspost components not showing up in latest chrome
Add settings for compass compile in prod vs dev

Fixes #712.
Merge pull request #713 from afuna/compass-environments-bug-712

Add settings for compass compile in prod vs dev
Remove warning for CLA

We now have an active link to it

For #663