add support for Keen IO
Merge branch 'master' of github.com:segmentio/analytics.js

Conflicts:
	Makefile
	analytics.js
	analytics.min.js
	docs/analytics.html
	docs/chartbeat.html
	docs/crazyegg.html
	docs/customerio.html
	docs/ga.html
	docs/gosquared.html
	docs/hubspot.html
	docs/intercom.html
	docs/kissmetrics.html
	docs/klaviyo.html
	docs/mixpanel.html
	docs/olark.html
	test/providers.html
Add support for Keen IO
add better to test for identify for Keen, fix up some dot notation
use cloudfront.net domain for keen JS lib so it works over https
Added FoxMetrics and tests
removed unused values and some minor updates
Add arguments to ga.js: value and noninteraction

When using segment.io and calling ga, there are two missing arguments (which I take advantage of)
So I added those two calls:
 properties.value,
 properties.noninteraction
Merging in keen.io
Merging in foxmetrics
Adding foxmetrics docco
Merge branch 'master' into rantav/patch-1
Updating makefile, with single file list
Updating google analytics calls
Updating docs