addressed issue https://github.com/globaleaks/GlobaLeaks/issues/514
Provide a slightly more elegant solution to #514

Visualise the context that is selected by default.
Do not require modification of the controller, but handle the case of only one context in the view directly.
Merge pull request #85 from globaleaks/issues/514

addressed issue https://github.com/globaleaks/GlobaLeaks/issues/514