added titles to hosts show page actions

fixes #160 - Last Report Date is client date, not date report was received

fixes #225 - migration fails - undefined local variable or method release_name

fixes #224 - edit multiple fails on operating system

fixes #222 - add search and sort functionality to dashboard host lists

fixes #220 - show all used puppet classes when using storeconfigs

• Remove active scaffold from hosts controller.
• changed default host graphs from one day for up to one week
• added dynamic dropdown boxes for host creation / edit page (e.g. for puppet classes, operating systems etc)....

fix closing tag in report template: s/capmion/caption/

fixes #200 - Remove activescaffold from the puppet groups page

fixes #217 - Before deleting a Hostgroup, warn that the hostgroup is in use.