Refactors TaskRc parser to match previous version written by @ralphbean.
Adds tests; fixes #51.
Merge pull request #52 from coddingtonbear/issue_51

Refactors TaskRc parser to match previous version written by @ralphbean.
Merge configuration overrides into taskrc configuration.
Update existing use of config overrides to match new datatstructure.
Merge pull request #53 from coddingtonbear/handle_config_overrides

Merge configuration overrides into taskrc configuration.