Update require_main.js

.js should be included in script paths. Currently, if you try to require one of the bootstrap scripts ```require(['app', 'jquery', 'bootstrapTooltip']``` an error is thrown when you try to use it or by requirejs:
```
$().tooltip();

// Uncaught TypeError: Object [object Object] has no method 'tooltip'
```
```
Request URL:http://mewmew.local:9000/bower_components/sass-bootstrap/js/bootstrap-tooltip.js.js

Uncaught Error: Script error for: bootstrapTooltip
http://requirejs.org/docs/errors.html#scripterror 
```
Merge pull request #142 from robwalch/patch-1

require_main.js: ".js" should not be included in config script paths