Integrate parallel requests with typhoeus gem.
Update README - add Parallel example and Changelog
Adapt the manual test to v3.0 interface
Merge pull request #20 from yaotti/fix-manual-test

Adapt the manual test to v3.0 interface
[Fixes #22] Update README to match mixpanel documentation.
Parallel feature merged with master
Merge pull request #12 from railwaymen/master

Parallel requests options
Bump version
Upgraded webmock to latest version so it's compatible with typhoeus.