Add jshint

Add jshint support for PRs on Travis.
Oops, copy paste error. 
--
tofumatt (Sent from mobile)

On July 25, 2014 4:28:29 PM EDT, Fred Wenzel <notifications@github.com> wrote:
>> @@ -21,7 +37,8 @@ module.exports = exports = function(grunt) {
>>  
>>      require('load-grunt-tasks')(grunt);
>>  
>> -    grunt.registerTask('default', ['build', 'watch']);
>> +    grunt.registerTask('default', ['test']);
>
>so default would be if you merely type "grunt"?
>
>---
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