switching from apiary to fbopen 18F github page

#108 New documentation link: http://18f.github.io/fbopen
Merge pull request #116 from 18F/docs-update

switching from apiary to fbopen 18F github page
More path fixes

Cron jobs will cd for the loader command,
but nightly/weekly scripts will now cd to
attachments directory for that portion.

We can work out all the relative paths at a
later date.
Unzip should not clobber existing files by default

This will allow the script to continue unattended
(e.g. via cron)

Also removing unneeded node package
Fixing unexpected absolute path bug

os.path.join lets the rightmost path with a slash prefix
be interpreted as the de facto absolute path to return
created script for test data, updated tests
Merge branch 'master' of https://github.com/18F/fbopen
Log exceptions in the attachment loader step
Merge remote-tracking branch 'origin/master'
added test for bids data
Merge branch 'master' of https://github.com/18F/fbopen
Reenable dynamic scripting for ES 1.2
Merge remote-tracking branch 'origin/master'
Add setup script and bring bash loader tests
mostly up to date

Certain sample data still could use updating to
the ext format, but it is not critical
Prettyfying some test output a bit for readability
Adding BIDS to the list of loader directories