Also allow simple expressions (without a dot) to be evaluated.

Right now, only "complex" expressions are evaluted: {{complexData.mesage}}
With this fix, it also evaluates simple ones: {{valu}}
As mentioned, this could be condensed to (or something similar):
```Javascript
var tempScope = (part.lastIndexOf('.') > -1) ? scope.$eval(part.substring(0, part.lastIndexOf('.'))) : scope;