Add tether to bower

bower_components/tether/docs/2-Examples/2-projects_using_tether.md

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+## Projects Using Tether
+
+Here at HubSpot we have built a bunch of libraries on top of Tether,
+both because we wanted Tether-performance, and because we saw opportunities
+to improve on what was available in the client-side ecosystem.
+
+### [Select](http://github.hubspot.com/select/docs/welcome)
+
+Select is a replacement for native browser select elements that is fully stylable.
+
+### [Shepherd](http://github.hubspot.com/shepherd/docs/welcome)
+
+Shepherd is a library for making tours of your app to help onboard users and show off
+new features.
+
+### [Tooltip](http://github.hubspot.com/tooltip/docs/welcome)
+
+A simple, easy-to-use implementation of tooltips that works well.
+
+### [Drop](http://github.hubspot.com/drop/docs/welcome)
+
+Where Tether does general-purpose positioning, Drop assumes that you are interested
+in making something which pops up next to something the user clicks or hovers on.
+
+If you're building something that fits that pattern, Drop can make things a little easier.
+
+### [React Datepicker](https://github.com/Hacker0x01/react-datepicker)
+
+A simple and reusable datepicker component for React
+
+### [ember-tether](https://github.com/yapplabs/ember-tether)
+
+An Ember.js-friendly interface for tether.
+
+### Your Project Here
+
+If you have a cool open-source library built on Tether, PR this doc, or [get in touch](mailto:zbloom@hubspot.com).