replace .box-shadow mixin
Merge branch 'master' of github.com:denkmal/denkmal.org into issue-115

Conflicts:
	library/Denkmal/layout/default/Component/Event/default.less
	library/Denkmal/layout/default/Component/EventDetails/default.less
	library/Denkmal/layout/default/Page/Events/default.less
formatting
fix bad merging
minor formatting
Merge pull request #115 from christopheschwyzer/issue-115

Drop Android 2.3 support