Invalidates rejection with wrong type or message arguments

[ferrao]

Fixes #119

[cjihrig]

This is a step in the right direction. I think the type checking and argument parsing in general still has a way to go. For example:

await Code.expect(Promise.reject(new Error('kaboom'))).to.reject(NaN);

NaN and a number of other falsey values don't cause this code to fail.

[ferrao]

@cjihrig I just tackled the problem that I noticed/was having, which was the message argument having a type different from string or regex. I did not realised the type argument had issues as well, will take a stab at it and resubmit again.

[ferrao]

@cjihrig, just pushed a new commit to check the type argument as well.

[ferrao]

@cjihrig do you think the current checks and tests are sufficient?

[cjihrig]

Thanks. LGTM

[lock]

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