Add earlier pre-10 API changes to CHANGELOG

Also reformat to be viewable in editors without wordwrap
and make it easier to reflow paragraphs of text.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #494 from enyojs/update-changelog

Add earlier pre-10 API changes to CHANGELOG

Reviewed-By: Cole Davis (cole.davis@lge.com)