Updating readability and functionality

First, Edited the format of the code to improve the readability.
[x] Removed the random space before each line
[x] Changed various locations where syntax was used differently than prior in the document.
[x] Converted all the bash style comments to multi/single line C/C++ style comments.
[x] Added block style comments for each method

Second, Updated the block style comments, fixed methods with 'couple' parameters.
[x] Added data types for each block comment parameter and updated the return types.
[x] Fixed the ticker functions 'couple' parameter, to set the default value correctly.

Third, Updated the API functions.
[x] Changed ticker function to call 'ticker' method via Cex.io API, which was not being implemented.
[x] Added order_book function, which correctly calls 'order_book' method via Cex.io API.