Update README.md

I added backbone.subroute to the jam repository
Added support for pushState URLs

Fix suggested by @ses4j in #5
Merge pull request #18 from davbo/push-state-support

Added support for pushState URLs
Skip call to loadUrl on SubRoute init if history hash does not match SubRoute prefix
updating docs for 0.3.2
Merge pull request #12 from jrf0110/patch-1

Add to jam package manager.
Merge branch 'master' into gh-pages