Move the gae-stats-fetching from toby to analytics, and consolidate logs.

Summary:
The analytics machine is going away, so these scripts need to find a
good home.  Toby is a good home.

In a separate commit (in fact, in a separate repo), I copied the
gae_dashboard directory from the analytics repo to the internal-webserver
repo (preserving history!, using the top-voted formula at
http://stackoverflow.com/questions/1365541/how-to-move-files-from-one-git-repo-to-another-not-a-clone-preserving-history),
so the new cronjob should work once it's installed.

I wanted to put these logs in the 'logs' directory, but it was owned
by the webserver user.  I decided it was more important to keep all
the logs in one place, so I made the logs directory world-writable and
sticky (like /tmp), and moved/symlinked all manner of logs files into
logs/.

Test Plan:
Fingers crossed.  Once this is checked in I'll install the crontab on
toby and try running the commands manually as well.

Reviewers: chris

Subscribers: jace, alpert

Differential Revision: http://phabricator.khanacademy.org/D9529
Move the gae-stats-fetching from toby to analytics, and consolidate logs.

Summary:
The analytics machine is going away, so these scripts need to find a
good home.  Toby is a good home.

In a separate commit (in fact, in a separate repo), I copied the
gae_dashboard directory from the analytics repo to the internal-webserver
repo (preserving history!, using the top-voted formula at
http://stackoverflow.com/questions/1365541/how-to-move-files-from-one-git-repo-to-another-not-a-clone-preserving-history),
so the new cronjob should work once it's installed.

I wanted to put these logs in the 'logs' directory, but it was owned
by the webserver user.  I decided it was more important to keep all
the logs in one place, so I made the logs directory world-writable and
sticky (like /tmp), and moved/symlinked all manner of logs files into
logs/.

Improve the mail that we send for error messages, and remove spurious backticks.

Suggested in review.

Test Plan:
Fingers crossed.  Once this is checked in I'll install the crontab on
toby and try running the commands manually as well.

(same)

Reviewers: chris

Reviewed By: chris

Subscribers: jace, alpert

Differential Revision: http://phabricator.khanacademy.org/D9529