Allow a different font to be used#8

This feature would allow a font other than FontAwesome to be used. This is desirable for a number of reasons: - FontAwesome has a wide variety of icons, but often lacks the kind of icons required by specialised web applications - FontAwesome has a slow release cycle, which can be frustrating - Grants the plugin a lot more flexibility This feature should be fairly easy to implement; there are two main changes that need to be addressed: 1. change the hard-coded font string to reference an option instead 2. allow a way to specify the CSS class for icon. For instance, FontAwesome icons require the class `.fa fa-<icon name>`. Suggested approach is thus: - specify a different font using a new `font` option, e.g. ``` javascript $(...).awesomeCursor('some-icon', { font: 'MyAmazingIconFont' }); ``` - specify CSS class using a new `cssClass` option, which can be: - a string, where `'%s'` will be the name of the icon, e.g. ``` javascript $(...).awesomeCursor('some-icon', { cssClass: 'fa fa-%s' }); ``` - a function, which would receive the name as the only parameter, and would be expected to return the CSS class for the icon; e.g. ``` javascript $(...).awesomeCursor('some-icon', { cssClass: function(name) { return 'fa fa-' + name; } }); ``` It may also be worth wrapping both of these new options in an object since they are so closely related: ``` javascript $(...).awesomeCursor('some-icon', { font: { name: 'MyAmazingIconFont', cssClass: 'fa fa-%s' } }); ``` However this is implemented, it will default to the usual FontAwesome-specific values. and will of course be overridable: ``` javascript console.log($.fn.awesomeCursor.defaults); // ... // font: { // name: 'FontAwesome', // cssClass: 'fa fa-%s' // } // ... ```