Fixed

• Expectation state persists among tests (#6)

Added

• Functions::when()->justEcho() to mock a function making it echo some value
• Functions::when()->echoArg() to mock a function making it echo one of received arguments

• Allow whenHappen() for added hooks
• Make current_filter() always return original hook name, even when hook names contain special chars, see #1

Improved hooks name sanitization, to avoid names collision.

Hamcrest-PHPUnit conflict has been solved. No need for the hack introduced in v1.1.2

Fixed bug reported in #1

Moved all setup to Monkey class