Update to 2.2 snippet and API
Fix specs checking for Mixpanel script presence
adding region and city to special person properties. adding set_once to person
Merge pull request #89 from michaelglass/2.2-javascript

2.2 javascript
bump version
Update README.md
Update README.md
spelling & grammar

no code changes
Merge pull request #90 from michaelglass/patch-1

spelling & grammar