add cperl-mode expansion rules for variable and package names.
licence change.
simple feature tests.
Merge pull request #83 from gugod/master

cperl-mode
Add Kang-min Liu to list of contributors
org-mode: expand to code blocks
Use Carton for dev-dependencies and CI

 - no more CI for Emacs 23
Travis CI: Try explicit PATH to Carton
Update README.md
Update README with Carton-instructions
Enable fgallina feature tests
Cleanup