Add ability to style row data by passing in style index value

ADDED: Row data will be styled according to the styleIndex param passed or will default to style index 0 which is referenced in the XML stylesheet.

FIXED: Fixed indentation in test file

UPDATED: Updated README file to indicate how to run the unit tests for the library. 	Update test to test with style indexes

ADDED: Use async library to execute async task. 	Add test for bigger data set