Revamping badge infrastructure
Puts markers on top of marker clusters
uses another instructor symbol
new past_bootcamp pin. Marker symbols now same as cluster symbol on all levels
First draft of skimage novice blog post
Beginning redesign
* very much a work in progress
* experimenting with header/banner/home page
updating gh-pages
Merge branch 'master' into updating-badging
Create BadgeClass

This is part of updating the badge system to v1.0.0.

Create three BadgeClass that represent the ones already used.

For information about the BadgeClass look at
https://github.com/mozilla/openbadges-specification/blob/master/Assertion/latest.md#badgeclass.
layout changes
Merge remote-tracking branch 'sc/master' into redesign

* sc/master: (54 commits)
  Just fix pip command line in README
  Add requirements.txt
  Bootcamp for librarians at Mozilla Toronto
  WiSE at LBL
  Removing links to v3 material
  Fixing wording in cold call example
  Fixing casing in title
  Blog post on DiRAC driving test run at Edinburgh
  New organizer badges
  Adding three more team members
  Making sure there's a trailing newline in the bootcamp URL config file
  Correct link for Man MATLAB
  Making keywords consistent
  Lynne Williams: what I've learned
  Adding more instructors
  Add Raniere Silva
  Added Manchester Matlab bootcamp
  Add Raniere Silva
  Putting link-checking command into Makefile
  Correct Julian Garcia's name
  ...
Create IssuerOrganization

Create a file that store the IssuerOrganization and add it address
into the BadgeClass.
Write script to update badges

For update `badge/some-type/some-badge.json`:

    $ python2 bin/badge-update.py -w badge/some-type/some-badge.json

For more options:

    $ python2 bin/bagde-update.py -h
Merge pull request #5 from r-gaia-cs/badgeissuer

Script to update badges
Update `bin/badge-update.py`

Thanks to @gvwilson to the comments.

Fixes:

* Check if the badges had been update previously.
Create pages for criteria for earning badges

The list of people reward with badges was moved from `badges/index.html`
to `badges/name-of-the-badge.html`.

TODO: The criteria for earning the achievement wasn't write yet.
Add hammer, updates templates for new layout
* footer still needs work
* not sure if I got all the pages
Remove dropdowns in navbar
* may want to add back in eventually?
use {{page.root}} in links
link to index.html -- not just /
* just in case