.gitignore

Added a .gitignore file so *.class files will never be included in the repo.
Check Key Existence

Added a ContainsKey method to the ConfigurationProvider class, which allows a consumer to check to see if a certain configuration key is set.
Get/Set Configurations as Boolean

Added methods to the ConfigurationProvider class which support getting/setting configurations parsed to/from booleans.
Merge pull request #4 from RobertLeahy/master

Add Features, .gitignore