Fix the key_val_setting parameter

This commit adds purging to ini file native types.

Purging will only work for child providers that
implement the method: self.file_path. This is
because collecting all instances of the type (
which is a requirement for purging) is only possible
when the path of the file that is being managed
can be accessed by the class instance (in the
method self.instances.)

This commit adds the following method to the internal
of the ini_file:
- get_settings - has of all settings/values for
a given section

It also adds the following method to the section
class:
- setting_names - list of all setting names in a
section.

These methods are required for the instances method
to be able to list the values for all settings of
each section.

Add purging support to ini file

This commit is intended to resolves an issue where the indentation
value can be nil (which leads to a run time exception)

This occurrs in cases where a section is following by only one of more
comments.

The proposed fix is to guard against potential nil values where the
error occurs. This fix is idential to code used at line 125 of the same file.

guard against nil indentation values

Added 'ini_subsetting' custom resource type

the previous tests were stubbing global class instances
in a way that was causing other tests to fail.

This commit updates the tests, and introdcuces child classes which
can safely be stubbed (and more closely test the real behavior intended to
be tested here)

fix unit test failures

This commit also adds some comments clarifying the new code
that was added to support purging.

Update Modulefile and Changelog, prepping for 0.10.0 release