Start preparations for 0.1.5.

First draft of notes for the upcoming releases, some notes might be in the wrong section.

Also there are a couple of unknowns, I'm working on this  stypi, if someone wants to help, I'll update before release https://code.stypi.com/abuiles/changelog-0-1-5.md

My current comparison is https://github.com/ember-cli/ember-cli/compare/15fb32baf7eea1752d3a75aabb12f42547788619...80cbc40

This was a bugfix that if you had a `liveReloadPort` of say `"4200"` in your `.ember-cli` config it would not actually end up as that port. This casts the string to a number so that the port is set correctly