ATLAS: new `atlas-higgs-challenge-2014.xml`

* New records for the ATLAS Higgs Machine Learning Challenge 2014.
  (addresses #660) (PR #664)
docs: new file `atlas-higgs-challenge-2014.xml`

* (see PR #664)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
fixtures: new coll "ATLAS Higgs Challenge 2014"

* Adds new collection "ATLAS Higgs Challenge 2014".
  (closes #724) (see PR #664)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
ATLAS: Higgs Challenge 2014 MARCXML update

* Uses MARC field 505 to store information about CSV column
  semantics.  (To be completed.)  (addresses #728)

* Adds collection indicators for "regular" ATLAS collections.
  (addresses #660) (see PR #664)

* Moves evaluation matrix information into MARC field 500.
  (addresses #660) (see PR #664)

* Improves indentation of MARCXML records.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
ATLAS: addition of Higgs Challenge 2014 CSV file

* Adds CSV file for the Higgs Challenge 2014.
  (addresses #660) (see PR #664)

* Corrects file size in the record metadata.

* Amends installation instructions accordingly.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
records: addition of 505 to JSON data model

* Adds MARC field 505, representing CSV column semantics, to the JSON
  data model.  (addresses #728) (see PR #664)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
docs: description of master/qa/production branches

* Explains the purpose and typical use of the new branch
  structure.  (master -> qa -> production)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
ATLAS: update of `atlas-higgs-challenge-2014.xml`

* (addresses #660) (PR #730)
ATLAS: unified FIXMEs in Higgs challenge file

* (see PR #730)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
ATLAS: Higgs Challenge 2014 software record update

* Updates ATLAS Higgs Challenge 2014 software record with link to GitHub
  repository.  Archives latest "v0.0" version.  (addresses #660)

* Removes second software record, since there will be only one software
  repository for now.

* Improves indentation of the MARCXML file.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
UI: creates page for "Atlas Higgs Challenge 2014"

* (addresses #724)
templates: creates macro for home exp-dropdown

* creates macro for experiment dropdown button on the homepage
UI: fixes in collection-boxes
templates: updates "Disclaimer" text

* displays license text if “license” field exists, else displays
default ‘CC0’ license
* (closes #732)
templates: adds LaTex displaying through MathJax
ATLAS: updates "Higgs Challenge 2014" xml file

* adds “$” for MathJax escaping
templates: updates ordering and adds 500 field

* updates order of ‘Dataset Semantics’ between file and urls
* displays ‘500’ fields
UI: adds route for '/glossary'

* (addresses #215)
glossary: updates anchors in json file

* (addresses #215)
UI: adds "Glossary" page

* (addresses #215)