Merge branch 'release/0.1.6' into develop
Merge branch 'hotfix/0.1.7' into develop
Add a friendlier “missing pdo sqlite” message.

This could probably still be improved, but it’s at least one step more understandable, so let’s ship it for now :)
Minor CS fixes.
Allow overriding PsySH configuration file.

e.g. 

$ psysh -c /path/to/some/psyshrc.php

Also, display prettier usage info when command line input validation fails. Because backtraces are ugly and not all that useful.

Fixes #64
Let’s allow modern PHPUnit :)
Clean up Readline service configuration.
Refactor MongoCursorPresenter::getProperties

 * Compose Method
 * Move accumulation to Collecting Parameter
Test all the versions!
hhvm doesn't work, prolly because of reflection
Bump version to v0.1.8
Merge branch 'release/0.1.8'