Consolidate the master/detail and drilldown views

(NOTE: https://github.com/sonatype/nexus-pro/pull/449 depends on this PR)

+ Makes drilldown the canonical way to move between lists of objects and their details
+ Removes master/detail-related files
+ Converts feeds to drilldown
+ Grants the ability to bookmark search results
+ Changes search filter syntax to something more JQL-like (ala Jira)
+ Fixes broken detail buttons on “Tasks” and “Capabilities” pages. :-(

In particular, I’d like feedback on the Drilldown controller, as it feels fragile.

**Feeds**

Before: http://monosnap.com/file/9WLZIPTbalJuniwwh8iDObsKPFjyVt
After: http://monosnap.com/file/w5EPtFFDmFRgX0585ntj3ivzE62hhu

**Search bookmarks**

Before: http://monosnap.com/file/Wi6Lq93XnmbHRENXxuhnpwQqiUxV9K
After: http://monosnap.com/file/WUrkFCn1n3ldnvanfsprRrFtESpQkR
Obsolete code removed.