preparation of beta release ?

Having used this package for a while, I find it globally quite usable, and believe phpactor is a really good solution for completion. Thus, I'd like to focus on making it easier to try, and also maybe move towards a beta quality release.

Do you see any things that should be addressed for that goal ?

From the top of my head, I can mention

* [x] close issue #59 about installation
* ~~[ ] code cleanup (like prefix uniformization towards ``phpactor--`` ?)~~
* [ ] readme improvements ?
* [x] provide company-phpactor through package (to be confirmed)
* [x] start using a develop branch for new features

Maybe for later
* [ ] tests, but that's a chapter I can't see opening really soon

Any suggestion welcome