Add integration kissmetrics

This commit copies the content of the integration repo into
the "integrations" folder.

Original repo: https://github.com/segment-integrations/analytics.js-integration-kissmetrics
Readme: https://github.com/segment-integrations/analytics.js-integration-kissmetrics/blob/master/README.md

integrations/kissmetrics/HISTORY.md

@@ -0,0 +1,76 @@
+
+2.1.1 / 2016-09-06
+==================
+
+  * Send products and revenue properly
+  * Discard undefined values
+
+2.1.0 / 2016-07-12
+==================
+
+  * Update Karma to 1.1.0
+  * Add an additional test case
+  * Use the provided page URL and referrer
+  * Eagerly load without assuming pageview
+  * Preserve _kmq if already defined
+
+2.0.0 / 2016-06-21
+==================
+
+  * Remove Duo compatibility
+  * Add CI setup (coverage, linting, cross-browser compatibility, etc.)
+  * Update eslint configuration
+
+1.0.9 / 2016-05-07
+==================
+
+  * Bump Analytics.js core, tester, integration to use Facade 2.x
+
+1.0.8 / 2016-02-10
+==================
+
+  * Update Group Method
+
+1.0.7 / 2015-11-03
+==================
+
+  * modify code to remain compatible with ie8
+
+1.0.6 / 2015-10-29
+==================
+
+  * flatten nested obj
+
+1.0.5 / 2015-10-29
+==================
+
+  * Map Group call in KISSMetrics
+
+1.0.4 / 2015-10-29
+==================
+
+  * Send revenue alongside billing amount
+  * Respect prefix setting
+  * Update KISSMetrics page call
+  * Use .timestamp instead of custom timestamping
+  * Fix borked tests
+
+1.0.3 / 2015-06-30
+==================
+
+  * Replace analytics.js dependency with analytics.js-core
+
+1.0.2 / 2015-06-24
+==================
+
+  * Bump analytics.js-integration version
+
+1.0.1 / 2015-06-24
+==================
+
+  * Bump analytics.js-integration version
+
+1.0.0 / 2015-06-09
+==================
+
+  * Initial commit :sparkles:

integrations/kissmetrics/README.md

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+# analytics.js-integration-kissmetrics [![Build Status][ci-badge]][ci-link]
+
+Kissmetrics integration for [Analytics.js][].
+
+## License
+
+Released under the [MIT license](LICENSE).
+
+
+[Analytics.js]: https://segment.com/docs/libraries/analytics.js/
+[ci-link]: https://circleci.com/gh/segment-integrations/analytics.js-integration-kissmetrics
+[ci-badge]: https://circleci.com/gh/segment-integrations/analytics.js-integration-kissmetrics.svg?style=svg