Merge pull request #7 from kennib/style

Style
Added a page with a list of murders
Updated tests to reflect new murder list page
Added missing murder list template
Made tables in articles have centered layouts
Merge pull request #8 from kennib/murder-list

Murder list
Seperated admin page into articles
Made some fields required in admin forms
Added MIME type for excel

On some computers excel MIME type overrides the CSV MIME type.
Merge pull request #9 from reneenoble/master

Added MIME type for excel
Added template function to the template namespace

This can be used to include templates with separate name spaces, e.g.,
``` {% raw template('link.html', url=game) %} ```
Merge branch 'master' of https://github.com/kennib/ncss-murder
Styled forms and form fields
Merge pull request #11 from kennib/admin

Styled forms and form fields
Modified headings to make mobile header smaller
Changed hamburger icon to font-awesome icon
Made headers appear consistently in Firefox
Fixed responsive view of forms