Disable front-end testing on Travis

Travis has dificulty running the front-end tests.
For now we'll disable them.
Merge pull request #685 from gannetson/disable-travis-front-end-testing

Disable front-end testing on Travis
Add language to user settings
Switch language to preferred language and store when changed
Highlight selected language
Set default for language and don't require it in API
Show organization documents in admin site
Button click bugfix
Merge pull request #686 from gannetson/store-language

Store language
Button click bugfix
Merge pull request #688 from gannetson/frans-tweak

Frans tweak
Merge branch 'front-end' of https://github.com/FransTwisk/bluebottle into frans-tweak

Conflicts:
	static/global/css/bootstrap/bootstrap.css
Merge pull request #689 from gannetson/frans-tweak

Frans tweak
 * adding payment method to donation overview
 * modifying yearrange
Enabled selenium tests on Jenkins and added instructions on how to reproduce the installation procedure.
 * using proper setter
 * spacing
Merge pull request #690 from maykinmedia/bb-1338

 bb-1338 - adding payment method to donation overview (please review)
Merge pull request #692 from maykinmedia/bb-1325

Bb 1325