Access all environment variables using a simple hash map.

This is a modified version of pull request #13, which I closed after seeing the error in putting in the EnvInject plugin dependency. Here is what my version will accomplish:

-Sets a hash map named "environment" that contains all of the environmental variables. This makes the process of getting variables more simple. (No EnvInject dependency)

-Added into the help file how to use the environment hash map.

Could you revert unrelated changes?
It can be done simply by comitting a change to revert them. You don't need to recreate changes you've already commited (Git has that feature, but it's confusing).