Removing assemble-handlebars dependency
Removing assemble-handlebars dependency

In an attempt to make template engines more like plugins
for Assemble, we're removing the assemble-handlebars dependency.
This will allow us to use a different "default" template engine
if we'd like. Now Assemble users will be required to do
`npm install` on their template engine of choice.

makotot/assemble,avr/assemble,valentinvieriu/assemble,edrohler/assemble,cgvarela/assemble,assemble/assemble,davidwickman/assemble,a0000001/test,assemble/grunt-assemble,assemble/assemble,xetryj/assemble,assemble/grunt-assemble,davidwickman/assemble,valentinvieriu/assemble,cgvarela/assemble,xetryj/assemble,edrohler/assemble