Updated parse_map_file() function

Updated parse_map_file() to output header as well as the data.
Updated all files that called parse_map_file to accommodate the changes.
Updated the test_util to accommodate the changes to util.py
Deleted script for 'header' parameter.
Fixed indentation errors in PCoA

[ci skip]
Updated API script for documentation.

Changed script syntax for better visualization for documentation.
[ci skip]
Merge pull request #14 from akshayparopkari/master

Modified parse_map_file() function to return the header in addition to the rest of the map. Resolves issue #10