Log Message:
Update to 1.13:

1.13 (2014/01/10)
 * Improve accuracy (Eric Leblond)
 * vim: correctly indent file (Eric Leblond)
 * add match on identifier name (Eric Leblond)
 * Merge pull request #11 from yhuelf/master (Eric Leblond)
 * vim plugin: cosmetics (Frédéric Yhuel)
 * vim plugin: allow use of "-l" option (Frédéric Yhuel)
 * fix version detection (Eric Leblond)
 * --version is not supported by all spatch version (Eric Leblond)
 * Add structure matching example. (Eric Leblond)
 * Add information about dependencies. (Eric Leblond)
 * Reorder README so we see installation part (Eric Leblond)