more helpful exception message when a parameter in DI config is missing
Merge pull request #3 from VasekPurchart/di-missing-parameter

More helpful exception message when a parameter in DI config is missing
Revert "DI: 'inject' option is enabled by default (experimental)"

This reverts commit d5b8b05ffbd032c11205a76b047def0a1ae295ba.

Conflicts:
	src/DI/ServiceDefinition.php
added some deprecation warnings for 2.0.x users
more readable exception strings