Add imag/real wrappers. - #41

Today I also stumbled over the missing passed parameters on the wrapped methods amin() and amax(). A merge would be appreciated.

I just picked up on this too, opened ticket #69

min and amin also have the same issue

Note that your fix of the out parameter is flawed: While the returned Quantity will indeed share data with the array passed to out, if the units of the value passed to out are off, it will actually hold wrong values. Thus, if the out parameter is used just to avoid the memory allocation, then your fix is fine; If you actually want the data to be placed in that array, your fix fails silently.
See my PR #87, which fixes both the out and axis parameters more thoroughly.

Sorry for neglecting quantities for so long. If you can incorporate @burnpanck's fix, and add a unit test, I will merge.

Ok, well two of the commits (adding squeeze and fixing some wrapped methods) are no longer needed. I've updated the PR to reflect what's left. I'll also add tests for what I'm proposing.

Done. I didn't add tests for quantitizer because I'm not really sure how to start (and I don't remember what I was doing when I hit the problems.) The fix is trivially correct, though.