Don't log potentially personally identifiable information at Error/Warning/Info levels

I've demoted possible PII to debug logging level. This includes things like
full response strings, key/value pairs of mapping data, etc, since this could
contain sensitive data. My assumption in doing this is that apps should be
able to ship with their logging levels set to Info, and not risk sending any
sensitive data to any 3rd parties that collect app logging, such as Crashlytics.
fix a typo
Merge pull request #2016 from mouse4d/fix/typo-fix

fix a typo in README file
Merge pull request #2014 from sadlerjw/reduce-sensitive-logging

Don't log potentially sensitive information at Error/Warning/Info log levels
Drop bind on Bundler in Gemfile
Convert project to XCTest
Fix NSManagedObject thread violations. refs #2022
Update project to Xcode 6 recommended settings
added missing bracket
Merge pull request #2038 from Kurry/bugfix/1984-typo-in-documentation

added missing bracket in documentation fixes #1984
Merge branch 'refs/heads/update_logging' into development

Conflicts:
	Code/Network/RKObjectRequestOperation.m