… arbitrary directory name and perform a reference count.

Update json schema to add support for 'file_count'

Update method walk_tree to allow for directory traversal to a certain depth by adding an optional argument max_depth
add method search_files where one can perform directory traversal based on regular expression. The 'max_depth' argument can be supported to limit search by directory level

Update regression test for walk_tree and add tests for search_files

Add example buildspec for 'file_count'

…alk_tree' and 'search_tree'.

numfiles will control how many files are returned that can be useful when limiting output.

The file_traverse_limit controls how many files are traversed during directory walk which can be useful
when going through a big directory tree or even '/' where directory walk may not be welcomed.

are traversed during directory search.
add example buildspec
add implementation support and update json schema

fix a bug during comparison check when calling min() function. One of the argument was a None type.