ALM-625 started refactoring CrossRef import code. Added import model and query_url method
ALM-625 fixed small formatting issue
ALM-625 only import type journal-article
ALM-625 added get_data and parse_data methods to import
pretty json formatting
ALM-625 create articles from CrossRef API response
ALM-625 query CrossRef API by ISSN, use sample parameter
ALM-625 handle validation errors on article import
ALM-680 change information on status page
changed version to 3.3-beta
Merge branch 'refs/heads/master' into develop

Conflicts:
	config/initializers/version.rb
Sanitize Devise parameters for Devise sign_up.
Allow password and password confirmation parameters
ALM-680 added cucumber tests
ALM-680 adjusted cucumber tests for status page
ALM-625 added rake task for import from CrossRef API, using ENV variables for options
ALM-625 crossref_import.rb is no longer needed
ALM-625 make offset and rows local variables
ALM-625 run article import in the background
ALM-625 show number of articles to import in rake task