Initialize local variable
Add R bindings to the README
Some coverity inspired cleanups
Increase use of config snapshots

And decrease extra reload checks of config data.
Merge pull request #2348 from stewid/add-link-R-bindings

Add R bindings to the README
Merge pull request #2349 from libgit2/rb/coverity-fixes

Increase config snapshot usage
Merge pull request #2351 from linquize/init-var

Initialize local variable