Allow addons to preserve `main` entry point.

This allows packages to support both standard NPM usage (where the
`main` entry point is to the actual library) AND Ember CLI usage by
using the `ember-cli-addon-main` property if it is present.

Packages like `ic-ajax` and `emberfire` can use this to support both
types of consumers.
Merge pull request #1052 from rjackson/allow-addons-to-not-change-main

Allow addons to preserve `main` entry point.
Fixed minor typos in CHANGELOG
Merge pull request #1057 from quaertym/master

Fixed minor typos in CHANGELOG
bump ember-data version
Remove redundant check for production
Move from `ember-cli-addon` to `ember-addon`.
Merge pull request #1066 from kimroen/allow-fingerprint-freedom

Remove redundant check for production
Merge pull request #1071 from rjackson/change-keyword-for-addons

Move from `ember-cli-addon` to `ember-addon`.
Update changelog for #1066 and #1071.
release v0.0.35