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Merge pull request #2 from sue445/pr/add_badges

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Use gemspec file's specification
Fix deprecated source setting
Ignore coverage directory
Fixed readme
Add Ruby 2.0.0 to .travis.yml
Bump rake version to 10.0.3
Updated gemfiles for travis
Add gemspec path
Check whether IdentityMap is defined. (for AR 3.0.x and >= 4.0)
Ignore gemfile.lock and TAGS
Enable query caching

ref https://github.com/rocketmobile/octopus/commit/8b3f2030a997214bf64646499d781821e5aa9aeb
Bump version to 1.1.1
typo
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