Run most recent spec

- [x] Explicit RunMostRecent command
- [x]  Implicit RunMostRecent for RunNearest (when in non spec file)
- [x]  Implicit RunCurrenSpecFile for RunNearest (when in non spec file)

https://trello.com/c/7qqAzsU1/2-run-last-spec-command-if-not-in-a-spec