add rspec-run-last-failed to rerun only failed examples

[ledbettj]

rspec-run-last-failed will re-run the specs that failed during the last invocation. By default this is bound to C-c ,f.

I'm not an elisp pro so I'm sure there's some cleanup that can be done here. Feedback welcome!

[rranelli]

I have not tested it yet, but I think this is an awesome feature :+1:

[ledbettj]

Changes:

• Replaced '() with nil.
• Added compilation hook locally instead of globally.
• Removed weird space.
• Fixed keybinding to be in the right keymap.
• Moved regexp logic into the rspec-store-failures function.

Thanks for the comments!

[ledbettj]

Thanks for the comment. I've updated the logic, hopefully correctly.

[ledbettj]

Dropped the save-match-data as well.

[dgutov]

Squash-merged. Thanks!

[ledbettj]

:+1: Thanks!