Added parameter matching for received messages

ISSUE #47 this allows the received function to work with a simple pipe
for equals as well as match  parameters via the matches macro

Currently the check in the equals macro is limited to received itself,
this should probably just be a is_function, but I didn't get it to work
inside the macro :(
Merge pull request #67 from sideshowcoder/parameters-for-received-messages

Added parameter matching for received messages