fix(uiGridHeaderCell): Change test measure method

Previous fix actually didn't fix anything because tests weren't running
with the CSS files compiled, as clean was running before single tests, and
the less task wasn't running.

This change runs less BEFORE the tests run so the CSS is present, this
matches the way the `dev` task works.

Gruntfile.js

@@ -606,7 +606,7 @@ module.exports = function(grunt) {
 
   // register before and after test tasks so we don't have to change cli
   // options on the CI server
-  grunt.registerTask('before-test', ['clean', 'jshint', 'jscs', 'ngtemplates']); // Have to run less so CSS files are present
+  grunt.registerTask('before-test', ['clean', 'jshint', 'jscs', 'ngtemplates', 'less']); // Have to run less so CSS files are present
   grunt.registerTask('after-test', ['build']);
 
   // Default task.

test/unit/core/directives/uiGridCell.spec.js

@@ -113,8 +113,8 @@ describe('uiGridCell', function () {
     var class1 = _(firstCol[0].className.split(/\s+/)).find(function(c) { return classRegEx.test(c); });
 
     // The first column should be 100px wide because we said it should be
-    expect(firstCol.innerWidth()).toEqual(100, 'first cell is 100px, counting border');
-    expect(firstHeaderCell.innerWidth()).toEqual(100, "header cell is 100px, counting border");
+    expect(firstCol.outerWidth()).toEqual(100, 'first cell is 100px, counting border');
+    expect(firstHeaderCell.outerWidth()).toEqual(100, "header cell is 100px, counting border");
 
     // Now swap the columns in the column defs
     $scope.gridOptions.columnDefs = [{ field: 'age', width: 50 }, { field: 'name', width: 100 }];
@@ -128,14 +128,14 @@ describe('uiGridCell', function () {
     expect(class2).not.toEqual(class1);
 
     // The first column should now be 50px wide
-    expect(firstColAgain.innerWidth()).toEqual(50, 'first cell again is 50px, counting border');
-    expect(firstHeaderCellAgain.innerWidth()).toEqual(50, 'header cell again is 50px, counting border');
+    expect(firstColAgain.outerWidth()).toEqual(50, 'first cell again is 50px, counting border');
+    expect(firstHeaderCellAgain.outerWidth()).toEqual(50, 'header cell again is 50px, counting border');
 
     // ... and the last column should now be 100px wide
     var lastCol = $(gridElm).find('.ui-grid-cell').last();
     var lastHeaderCell = $(gridElm).find('.ui-grid-header-cell').last();
-    expect(lastCol.innerWidth()).toEqual(100, 'last cell again is 100px, counting border');
-    expect(lastHeaderCell.innerWidth()).toEqual(100, 'last header cell again is 100px, counting border');
+    expect(lastCol.outerWidth()).toEqual(100, 'last cell again is 100px, counting border');
+    expect(lastHeaderCell.outerWidth()).toEqual(100, 'last header cell again is 100px, counting border');
 
     angular.element(gridElm).remove();
   }));