Allowing service classes to pass in a custom configuration hashmap
Adding .gitignore
Removing obsolete test cases
Adding ContainsKey validation from config elements
Bumping version no to 1.2.0
   Bumping version no to 1.2.0 for dynamic configuration release
Removing ConfigManager's GetProperty method
Adding default configuration properties
Fixing use of incorrect case in config parameters
Adding mode based configuration of API endpoints
Renaming configuration related Constant variables
Fixing static initialization of ConfigManager when not using file based configuration
Adding custom configuration support for IPN messages
updated developer account email