Fix template conflict between Yeoman and Grunt
Fix gruntfile template
Merge branch 'grunt-yeoman-conflict' into dev

Conflicts:
	app/index.js
	app/templates/Gruntfile.js
Default install plugin
Fix task not found

Remove load-grunt-task and fix gruntfile for plugin.
I'm confuse how to use it. Ref: #16

Close #18
Various fixes

 - Change homepage
 - Remove unused code
 - Fix preset for permalink
Add .yo-rc.json to gitignore template
Update docs and bump version