Add integration optimizely

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

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

Author: SegmentDestinationsBot

integrations/optimizely/HISTORY.md

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+
+3.4.1 / 2018-04-05
+==================
+
+  * also strip colon in event name for full stack (#42)
+3.4.0 / 2018-03-13
+==================
+
+  * Replace colons in event names with underscores (#41)
+
+3.3.2 / 2017-11-15
+==================
+
+  * Add 'isInCampaignHoldback' property to track calls
+
+3.3.1 / 2017-04-17
+==================
+
+  * Tag for new release.
+
+3.3.0 / 2017-04-17
+==================
+
+  * Adds option `onlySendRevenueOnOrderCompleted` to send revenue only on `Order Completed` events, which will default to `true` for new users  
+
+3.2.1 / 2017-03-23
+==================
+
+  * Round revenue values to nearest integer
+
+3.2.0 / 2017-03-16
+==================
+
+  * Include event tags property in the Optimizely X Fullstack track call as defined by track.properties()
+  * Use user traits as user attributes instead of event properties
+
+3.1.1 / 2017-01-17
+==================
+
+  * Update Web track call to use Optimizely X new-style API call (works with Classic and X)
+  * Include tags property in Web track call as defined by track.properties()
+
+3.1.0 / 2016-12-05
+==================
+
+  * Add integration for FullStack Javascript SDK for track calls
+
+3.0.4 / 2016-10-05
+==================
+
+  * Minor bug fix
+
+3.0.3 / 2016-10-05
+==================
+
+  * Refactor code
+
+3.0.2 / 2016-10-05
+==================
+
+  * Fix Section Names and Ids
+
+3.0.1 / 2016-09-30
+==================
+
+  * Fix logic to correctly track redirect experiments
+
+3.0.0 / 2016-09-29
+==================
+
+  * Support Classic, X, and Both versions of Optimizely
+  * Support sending all types of activations (conditional, manual, immediate) to Segment
+
+2.0.0 / 2016-06-21
+==================
+
+  * Remove Duo compatibility
+  * Add CI setup (coverage, linting, cross-browser compatibility, etc.)
+  * Update eslint configuration
+
+1.1.9 / 2016-05-07
+==================
+
+  * Bump Analytics.js core, tester, integration to use Facade 2.x
+
+1.1.8 / 2016-04-19
+==================
+
+  * Remove value and total tests
+  * Remove mapping of value to revenue
+
+1.1.7 / 2016-04-08
+==================
+
+  * Improve tests and fix integration flag bug
+
+1.1.6 / 2016-03-31
+==================
+
+  * Implementing a method to track integration usage
+
+1.1.5 / 2016-03-23
+==================
+
+  * Removed ID call
+
+1.1.4 / 2016-02-24
+==================
+
+  * fix undefined bug
+
+1.1.3 / 2016-02-23
+==================
+
+  * support manual/custom activations aka redirect exp
+
+1.1.2 / 2015-10-21
+==================
+
+  * Send userId to Optimizely
+
+1.1.1 / 2015-10-13
+==================
+
+  * adding support for multivariate experiments closes #2
+
+1.1.0 / 2015-09-08
+==================
+
+  * update properties on trackEvent and add revenue fallback
+  * add nonInteraction flag for roots/listen event
+
+1.0.4 / 2015-06-30
+==================
+
+  * Replace analytics.js dependency with analytics.js-core
+
+1.0.3 / 2015-06-24
+==================
+
+  * Bump analytics.js-integration version
+
+1.0.2 / 2015-06-24
+==================
+
+  * Bump analytics.js-integration version
+
+1.0.1 / 2015-06-10
+==================
+
+  * Bump dependency versions
+
+1.0.0 / 2015-06-09
+==================
+
+  * Initial commit :sparkles:

integrations/optimizely/README.md

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+# analytics.js-integration-optimizely [![Build Status][ci-badge]][ci-link]
+
+Optimizely 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-optimizely
+[ci-badge]: https://circleci.com/gh/segment-integrations/analytics.js-integration-optimizely.svg?style=svg