Added back in the rdoc, rcov, rcov_display tasks that were accidently removed.
Added back in the rdoc, rcov, rcov_display tasks that were accidently removed.

wvanbergen/scoped_search,lzap/scoped_search,lzap/scoped_search,jlsherrill/scoped_search,johnpmitsch/scoped_search,wvanbergen/scoped_search,jlsherrill/scoped_search,johnpmitsch/scoped_search