Update GitHub links to SSL version; Juice up its H in the name

- GitHub has the humpty dumpty H
- All links to GitHub are on SSL, update accordingly
- Some of the GitHub help docs have moved as well

JavaScripts could be a valid plural of JavaScript but at least it
needs the pumped up S and the bigged up J.
Or "JavaScript files" if you want to jump that way.

Fixes #74
Add 1.3.0 release notes
Use 1.3.0 as latest stable
Possession and allowance on its and lets

- Its is the possessive one,
  it's the contraction
- Lets is an allowance for things,
  let's usually warms our introduction

Fixes #77
[customization] anyway typo.

Fixes #78
Update source/getting_started.textile

Light typo edits
[ubuntu-deploy] Must include spree assets within static assets block in nginx config
Shipping category impact on ship method.
Fix broken link