Fixed Grunt's jshint tasks to be able to merge options

Hi guys,

This PR is an additional fix for #408 

According to https://github.com/gruntjs/grunt-contrib-jshint/pull/24#issuecomment-15029207
```jshint options``` could not be merged with ```.jshintrc``` so we need to use

```JavaScript
options: grunt.util._.merge({}, grunt.file.readJSON('.jshintrc')),
````
to merge the required options.

In addition, I did correct some project's paths and ignores for ```jslinting```, probably they will be updated soon again =)