Update grid.js

adding $utils to searchProvider to support evaluating fields that are functions
Update searchProvider.js

added $utils to searchProvider, changed var value assignment to support evaluating fields that are functions

change line from
var value = item[condition.column] || item[col.field.split('.')[0]];
to:
var value = item[condition.column] || item[col.field.split('.')[0]] || $utils.evalProperty(item, col.field);
Merge pull request #1182 from markbauer1975/master

fixed filterText to work with fields that are methods