Use `logging` module instead of prints in migrater script

I replaced `fail` function printing out to `stderr` with `logger.debug`
(from Python standard library).

Additionally I introduced `info` function that indicates migration
progress.  It simply logs out "Successfully migrated 'TABLE' table",
so that user knows the script is running error-free.
Fixed #104, adds jQuery from CDN.
Starting to work on script to import legacy notes
Change default logger name in migrater script

It used to be `"__main__"` because that's what `__name__` defaults to
when invoked directly.  Using string name (`"amy-migrater"`) ensures
that logger has it's own recognizable namespace.
Change `migrater.py` verbosity

For now I stick to hard-coded verbosity of INFO messages (ie. every
message with higher or equal severity to INFO will be shown).
Consult https://docs.python.org/3/library/logging.html#levels for the
list of logging message levels.
Merge pull request #100 from pbanaszkiewicz/morelogging

Use `logging` module instead of prints in migrater script
Merge jQuery from CDN

We need this Bootstrap requirement.  Ideally I'd like a bower.json to
make it easy for folks to download and use local copies.  Kevin Bowrin
has something close in the rest of #105 [1], but it's more complicated
than what I have in mind (with a bower.json and hard-requirement on
Bower instead of Kevin optional-Bower-falling-back-to-CDN).  Merging
7d38239 gets us a working Bootstrap until I have time to put that in.

* commit '7d38239':
  Fixed #104, adds jQuery from CDN.
Adding site handling to notes importer
Adding count of instructors to "all events" page.

There isn't room to display all the instructors next to the event on the "all events" page, so this displays a count instead, and highlights workshops that are missing instructors.

1.  Modify `all_events` function to decorate event objects with number of instructors.
2.  Modify view to display those counts.
3.  Modify base `_page.html` to load CSS to highlight events with no instructors.
Adding people to event display.

This PR adds a table of people involved in a workshop to the event's display.
Bringing in some sanity checks from the old database system.

1.  `make check` now runs some SQL queries against the database to check things that aren't easily captured in SQL constraints.
2.  `db.sql` updated to contain latest actual database (faked).
Adding more reporting to the Makefile.

These reports should be moved into the application so that their output can easily be copied and pasted.
Fixing issues based on @wking review
Merge pull request #112 from gvwilson/11-add-instructor-names-to-event

Adding count of instructors to "all events" page.
Merge pull request #107 from gvwilson/importing-old-notes

Importing old notes
Merging changes to Makefile