[NEXUS-6251] Redirect yum create/merge repo to nexus log
Merge pull request #755 from sonatype/nexus-2.11.x-NEXUS-6251-yum-output

[NEXUS-6251] Redirect yum create/merge repo to nexus log
Ruby client for hosted, proxy and group reposes.
Add helper methods to ruby IT support
remove unused config files.
NEXUS-7514: Fixes to ITs to follow common pattern

Also, using newly added Client and nexus.xml mangling
removed.
Added/updated license headers
Merge pull request #765 from sonatype/NEXUS-6905-merge-rubygems-client

Ruby client and ITs
Merge branch 'nexus-2.11.x' into NEXUS-6905-merge-rubygems
refactored dependency related tasks into more OO manner and
use better integration of java and ruby.

this also avoids opening many streams (to files) instead it
needs only one stream at a time.