Corrected documentation related to andReturnValues() method.
Merge pull request #134 from telkins/master

Corrected documentation related to andReturnValues() method
Fix for Return by Reference Bug

When trying to mock a function that returns by reference, the internals
of the mocked class do not actually return by reference - because the
call to the __call function makes it return by value.  Assigning this to
a variable and then returning it allows it to not throw a "Only variable
references should be returned by reference" error.  This doesn't affect
functions that aren't return by reference - other than adding a new
variable to be Garbage Collected.
Merge pull request #135 from protecinnovations/hotfix/ref-bug

Fix for Return by Reference Bug
Test for #135
Merge pull request #136 from davedevelopment/test-for-135

Test for #135