Update RubyGems source.
Upgrade HTTParty to 0.10.2.
Remove Bundler version requirement.
Upgrade Jeweler to 1.8.4.
Replace RCov with SimpleCov.
Upgrade RDoc to 4.0.0.
Upgrade RSpec to 2.13.0.
Upgrade Rake to 10.0.4.
Update gemspec quote format.