Add support for intercom secure mode

http://docs.intercom.io/#SecureMode
Use settings for userHash instead of traits
Merge pull request #28 from buger/intercom_secure_mode

Add support for intercom secure mode
Update History.md
Removing root references
Adding missing development dependencies.
adding a rough draft of tracking an event from the url parameter
fixing up url parameter event tracker and adding tests
adding identify parameter and improving param naming
adding underscores to param names
adding another test for blank window.location.search
Minor renaming, bumping version
Merge pull request #30 from segmentio/urlparamtrack

Add ability to automatically track events from URL parameter "anjs"
Bumping version in source
Merge branch 'master' of github.com:segmentio/analytics.js
Updating release
Merge pull request #29 from peleteiro/master

Adding missing development dependencies.
Updating history
Merge branch 'master' of github.com:segmentio/analytics.js
add extra test for propertyless event to gosquared, and got it passing