remove bootstrap3 python module dependency
Merge branch 'master' of github.com:fgirault/smeuhsocial into v1.5
Revert "remove bootstrap3 python module dependency"

This reverts commit 0d22b5ce4eb461d552dff8e5a99b3a104a2f803b.

I made use of it in 76ff543 since it was there. If it's a bad idea then
we'll need to fix comment preview.
Better title for comment preview page
Fix MediaElement.js layout bug

Ref #50