Adding .rz files as binaries
Fix for JRuby lazy creation.

By mistake, commit b68e61dc35ddd84a933926c14c760cfe6e472af5 made
JRuby container creation to be non-lazy.

This fixes it, and simplifies it by introducing a
lazy provider that also cleans up.
[NEXUS-6790] Copy yum metadata to group in case of a single yum member

commit 733115040ee852a206e25fc8ed822c3d733cd9fb
Author: Alin Dreghiciu <adreghiciu@gmail.com>
Date:   Tue Oct 21 19:09:31 2014 +0300

    [NEXUS-6790] Fix test about conccurent running of MergeMetadataTask

commit 23886a203b7860cc04280dd5d68a00af474b4a23
Author: Alin Dreghiciu <adreghiciu@gmail.com>
Date:   Tue Oct 21 18:59:04 2014 +0300

    [NEXUS-6790] Only copy when there is exactly one member

commit 3be3e20300823cfc6f22db89ab82282f33736665
Author: Alin Dreghiciu <adreghiciu@gmail.com>
Date:   Tue Oct 21 18:19:34 2014 +0300

    [NEXUS-6790] Copy yum metadata to group in case of a single yum member
Merge pull request #811 from sonatype/fix-jruby-lazy-creation

Fix for JRuby lazy creation.
Logging JRuby container creation at INFO level
set metadata max age to practical default
verify the expiration of volatile dependencies files on proxy