PBUG-150: fix DOI search.

I'm in the process of testing this, but it is rather involved, so just checking in the fix first.
Merge branch 'pbug-150'
Update webapp/src/main/webapp/javascript/ga.js

Updated to include PLOS Collections patch & Cross domain tracking issue (session IDs)
Update webapp/src/main/webapp/javascript/ga.js
FEND-849 search results page complete ++
FEND-849 trying to commit final file version
Merge branch 'jan_r2' of https://github.com/PLOS/ambra into danGit

Conflicts:
	webapp/src/main/webapp/javascript/searchResults.js