templates: updates "500" field to display better

* fixes LaTeX code and delimeters for better mathjax displaying
templates: fixes wrong link displaying for '516'

* updates json schema for ‘516’ to list
* (addresses #450)
templates: ATLAS Higgs challenge text update

* (PR #738)
ATLAS: Higgs Challenge 2014 record text updates

* (PR 737)
ATLAS: Higgs Challenge github repository update

* Updates location of the ATLAS Higgs Challenge 2014 github
  repository.  (addresses #660)

* Updates record metadata and installation instructions accordingly.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
ATLAS: Higgs Challenge documentation full text

* Adds preliminary version of the ATLAS Higgs Challenge 2014
  documentation PDF file.  (addresses #660)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
UI: updates for 'Glossary'

* removes ‘glossary’ box on Education section page
* adds link: ‘About’ > ‘ODP Glossary’
UI: updates wording in "Terms of use"

* (closes #715)
UI: "ODP Glossary"->"Glossary"
js: adds javascript for glossary page scan

* adds zGlossary library with modifications
UI: adds coll_title to "ATLAS Higgs Challenge"
UI: glossary - adds WIP tags

* adds WIP ‘status’ tags, so unfinished terms won’t show up on the
glossary page
* (addresses #215)
UI: adds functionality for glossary page scan

* creates necessary glossary blocks
* adds glossary term search on ‘main_content’ of pages
* creates a minified version of glossary.json to use as dictionary
* (addresses #215)
UI: adds 'no-glossary' class in page sections

* adds 'no-glossary' class in page sections we don’t won’t to be scanned
* (addresses #215)
UI: changes wording in T&C

* (addresses #715)
UI: adds "external link" icon on external links

* adds “external link” icons on the beggining and end of a link