homepage: FIX testimonials

* corrects file path for json
news: removes links on authors
templates: animated physics objects GIFs

* Adds animated GIFs showing good and bad objects.
  (closes #228) (PR #288)
templates: "Other CMS open data" above "Policies"

* Fixes error introduced in previous change. Policies are now at bottom
  of page.  (PR #277)
templates: div class fix in VM page

* Fixes div class in VM page.  (PR #289)
templates: CMS VMS backlink in Getting Started

* Adds backlink to CMS VM in Getting Started page.
  (fixes #283) (PR #289)
templates: CMS news text edited to reflect email

* Modifies the text of the CMS news item to reflect the email sent to
  the whole collaboration on 2014-09-22. (PR #295)
templates: removal of arXiv/ADS in privacy page

* Removes references to arXiv/ADS in Privacy Policy page.
  (fixes #294) (PR #297)
templates: fix news quoting

* Fixes trace back in news. (closes #282)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
UI: Remove "Lorem ipsum" below images on Edu/Rsrch

* (closes #298)
UI: Replace image for "histograms"

* (closes #299)
UI: introduces "Export" modal/popup

* (addresses #303 , #304)
collection: lighter black on "more" button

* (addresses #293)
UI: FIX OL broken on "physics" page

* (closes #309)
data: addition of CMS masterclass files from DocDB

* Adds CMS masterclass files from DocDB.  (closes #67) (PR #287)

* Merge note: installation instructions amended accordingly.

Tested-by: Tibor Simko <tibor.simko@cern.ch>