Added extend loadDefaults options

Options extension to provide a loadDefaults object. This will give the option to disable 4 different options angular, angular-animate, marked, and prettify (google) which usually get loaded through defaultScripts.

This would give the user the ability to disable any scripts if they are using methods outside of regular angular/animate loading like browserify .
Merge pull request #17 from Aourin/patch-1

Added extend loadDefaults options