This module is for the 0.5.x version of Apostrophe. In Apostrophe 2.x, apostrophe-pieces is a built-in Apostrophe module that provides very similar and greatly improved functionality (see the tutorials). This module will not work in a 2.x project and you do not need it.
apostrophe-snippets adds a repository of reusable content snippets to the Apostrophe content management system. Snippets can also be subclassed to implement new content types.
Please see the Apostrophe documentation for complete information.