Merge pull request php-fig#70 from greg0ire/better-typehints

Be explicit about mixed context elements

Add "exception"-context array key to docs

Merge pull request php-fig#55 from DQNEO/namespaced-phpunit

use namespaced PHPUnit

Release 1.1.0

Merge pull request php-fig#49 from mindplay-dk/master

return types were incorrectly hinted as `null`, should be `void`

Make compatible with latest phpunit

Remove psr/log-implementation requirement since the package itself ha…

…s a NullLogger implementation