Fix keyspaceCache-classname in runtime_cache
Cache repo-shas in runtime_cache for git source
Add "backports" for "public_send" in ruby < 1.9.1
Merge branch 'issue-163' of https://github.com/njam/librarian into njam-issue-163
Revert "Add "backports" for "public_send" in ruby < 1.9.1"

This reverts commit 94b76cb1303bdc13e9d3f5688f32695ff4bc6eac.
Reduce the number of git ops by caching more.
Merge branch 'njam-issue-163-revise'