Handlebars is MIT-licensed

The package.json list Handlebars as having a BSD license, but the readme says it's MIT licensed
Update README.markdown

Added "Ghost" (Just a blogging platform) to "Handlebars in the Wild".
Fixes issue where cli compiles non handlebars templates
Merge pull request #657 from chrishoage/master

Fixes issue where cli compiles non handlebars templates
Merge pull request #650 from thomasboyt/patch-1

Handlebars is MIT-licensed
Merge pull request #653 from k-j-kleist/patch-1

Update README.markdown