0.1.3

This release contains improvement to configuration validation:

• It no longer prompts a user about overwriting a file that hasn't changed.
• It now prompts the user to backup files before overwriting. The prompt will contain a diff of the changes. These backups will use a .bak extension, so they can be easily added to .gitignore.
• The .configure file can now optionally provide a file_dependencies list. Any files on the list will be checked for changes before warning about an out-of-date .configure file. Directories can also be specified in the list – their contents will be checked against the .configure file pinned hash.
• Running configure_update will now apply the configuration changes, rather than just pulling them down from the remote repo.