Updating the script used to check validity of workshop website home page.

1. Imported checking script from `swcarpentry/bc` repository.
2. Modified `README.md` to clarify formatting of month names in dates.
Importing tests for index page checking script.

1. Brought in `test_check.py` (Nose tests).
2. Edited.
3. Renamed `check` to `check.py` so that `test_check.py` could import it.

Tried to avoid #3 by using `imp.load_module`, but was unable to get it
to work properly: best case, running `nosetests` created a file `checkc`
(which is presumably the bytecode file for `check`).  Rather than have
that lying around, renamed the script.  There's gotta be a way...
Suppressing output of 'curl' command
Merge pull request #9 from gvwilson/adding-checking-script

Adding tools to set up and check repositories.