doc -> docs

Update docs

Update zephir

fix: variable types

Implement pass by ref

Update Zephir

Update .travis.yml 2

Update .travis.yml

Update Zephir

Delete zval_ref.c

Temporary solution for 'zephir reference'

Merge branch 'master' of https://github.com/organization/RapidPM

Update .travis.yml

Update TODO.md

Update RapidPM (reflects PMMP library update)