Updating gitignore.
Updating code formatting for Google Java Standards.
Cleaning up project and refactoring method names for lowerCamelCase. Fixing integer overflow with cancelOrder().

Updating code format for increased line length (80 to 100).

Cleaning up project and refactoring method names for lowerCamelCase. Fixing integer overflow with cancelOrder().
Adding Ghash.io API functions and test cases.
Adding Cex.io API function for last_price and adding example case.
Giving the README an update to increase the ease of use and document new methods.
Adding Cex.io API function for convert and adding documentation; Updated post function to allow for parameters without API authentication.
Adding Cex.io API function for getting historical currency data, updating documentation and examples.