Added support for a simple mapping api method. Given that a user has defined the tags for which he/she wants to pull all properties as a map, let them supply an instance of a map, and populate it.
Can be user to populate java.util.Properties or any other map instance.
adjusted the implementation for #43 after feedback.
Merge pull request #43 from kenglxn/master

Added support for a simple mapping api method. Given that a user has def...