Class based views

Changed all views to class based views.
Removed deprecated first_on_page from article template.
Removal of Http404 from personal views
Removed controls for missing context from personal pages. These pages are not accesible by clicking. Empty page will be displayed.
Added allow_empty option to ArticleList
Removed custom class for Grant and Thesis detail view. Used generic.
Added except type to ArticleList.
Removed try block from PersonArticles
Get_common_context(nickname) changed to Mixin
UnitTests

Tests for class-based views:
    GrantList and GrantDetail
    ThesesList and ThesisDetail
    Lists of students and memebers of staff
    override_settings decorator to Tests to force en language.
    Unittests for OPPO specific pages
Default template names

Renamed templates to default names.
Removed template specification from views and urls.
Removed unused template fuuk/templates/thesis_defend_page.html
Ordered on Queryset and default for BooleanField
Cleaned queryset in RetiredList
Merge pull request #16 from FUUK/class_based_views

Class based views