Fix issue with globbing exclusions against relative filepaths

So, was having an issue with grunt-contrib-watch not properly globbing the following exclusion:
````javascript
//Gruntfile.js
        watch: {                                                               
            js: {                                                              
                files: [                                                       
                    '<%= yeoman.app %>/**/*.js',                               
                    '!**/node_modules/**'                                      
                ],                                                             
                tasks: ['dev']                                                 
            }                                                                  
        },                                                                     
                                                                               
        yeoman: {                                                              
            app: './app',                                                      
            build: './.build',                                                 
            dist: './dist'                                                     
        }             
````
Tracing the problem through grunt-contrib-watch -> gaze -> globule@1.0.0 reveals that neither globule@1.0.0 or @2.0.0 properly handles an exclusion glob when some relative filepath is used -- i.e., it is unable to differentiate between the following:
````
app/js/foo.js //returned from minimatch('**/js/**') in globule#processPatterns
./app/js/foo.js //the filepath that should be matched and excluded. (in results [])
````
This patch fixes the issue by using path.resolve to normalize to absolute paths when running a comparison against the exclusion.  Next steps would be to file bug with gaze to update it's dependency and then grunt-contrib-watch to update gaze.

Unit tests of issue added as well.

Thanks