Add ruby API for accessing the "keychain" route
Add documentation for keychain helper methods
yardocs for keychain_helpers
added yard ignores
updated the keychain helper docs
bumped gem/server versions to 0.9.169.pre2
updated changelog with details keychain API and documentation effort
rolls back version to 0.9.168.pre3 and merged 169 changelog back to 168
Merge pull request #338 from jmoody/fix-pr/jgallagher-add-keychain-support

FIX PR #323 Add ruby API for accessing the "keychain" route