Upgrade jshint to 1.1.0

Provides unused: 'vars' for example which is usefull

http://www.jshint.com/blog/2013-03-05/1-1-0/
0.3.4
Fix a Windows bug

 - Use spawn() instead of exec()
 - Change path of jshint for Windows
0.3.5
Fix jshint command
0.3.6
Upgrade jshint to 2.1.2

Provides .jshintrc not only for top directory, usefull for having
multiple .jshintrc in different folders
0.3.7