Why:
* Planning on developing a new feature for parsing of stowrc files.
* Need a test harness that performs initialization and clean up
* Initialization: Create directory structure that allows creation of
stowrc files without worrying about squashing existing files.
* Clean up: Remove all files created during testing.
This change addresses the need by:
* Add intialization and cleanup harness in t/rc_options.t
* Define the location to write stowrc files to in $RC_FILE
* Ensures that location $RC_FILE does not already exist.
* Calls the init_test_dirs to bootstrap directory tree.
* After all tests are run, removes $RC_FILE and the testing
directory tree.
* Add basic test of stowrc parsing to t/rc_options.t
* Provides a template of how to create and test a stowrc file.
* Newly created t/rc_options.t file added to MANIFEST
