Dray Lacy

Exclude ember-try packages from npm publish

1

As in `ember-route-action-helper` ([see relevant PR here](https://github.com/DockYard/ember-route-action-helper/pull/89)), the `ember-try` packages aren't being ignored by `npm publish`, which adds 128MB to the size of the package.

Add #strength for ECDSA keys

5

Currently there's no `#strength` method for `OpenSSL::PKey::EC` instances. These are [Elliptic Curve DSA keys](http://en.wikipedia.org/wiki/Elliptic_Curve_DSA).