Fixed deprecation warnings
Added files in different charset encodings to test-repo
Added encoding-specific tests cases
UTF-8 encoding must be enforced on Manifest's contents

On ruby 1.9.1 and higher
UTF-8 encoding must be enforced on diff's file paths

On ruby 1.9.1 and higher
Version bump: Ruby 2.0 encoding compatibility updates
Regenerate gemspec for version 0.7.9