5.4 - set_error_handler to restore_error_handler

set_error_handler(null) is >= 5.5

restore_error_handler() is 5.4 compatible and pops the most recent error handler off the stack, which appears to serve the same intended effect
Cleaned up unused variable
Merge pull request #34 from jamesshannon/patch-1

5.4 - set_error_handler to restore_error_handler
Add a failing test for #35
Don’t throw error exceptions for all errors.

When including or executing in the execution loop, only throw error exceptions for errors above the current error_reporting threshold.

Log the rest for posterity, but let the code finish anyway.

Fixes #35
Make non-error errors a bit nicer.

Always style errors below the current reporting threshold as warnings.

See #35

Styles E_NOTICE and E_USER_NOTICE as warnings as well.
Add an Exception Presenter.
Add a MongoCursor Presenter.

Don’t enable it by default, but mention it in the README. Mebbe it’ll encourage people to write more Presenters.
Merge branch 'master' of https://github.com/ju1ius/psysh into julius-master

Conflicts:
	src/Psy/Presenter/ObjectPresenter.php
Fix for '0' strings, because PHP
(Minor tweaks)
Add an abstract class pass.

This code cleaner pass enforces that abstract methods only belong in abstract classes, and that abstract methods don’t have a method body.

Fixes #25
Add composer global instructions
Code cleanup
Tests cleanup
Merge pull request #37 from vicb/test/cleanup

Tests cleanup
Merge pull request #36 from vicb/cleanup

Code cleanup
Clean up help commands.

Add some more help, and some more TODOs.

See #36
More code cleanup.

Thanks, php-cs-fixer!
Update Compiler for psr4-aware composer.