response called after rotate in stream.py #35

hello, there is a minor issue when dealing with 12Z etc channels in stream.py.

currently they are rotated FIRST (which rotates 12Z to a ZNE frame), and then the inventory is used to remove the response AFTERWARDS. this will cause an inventory error because the newly rotated "ZNE" channels are not in the inventory, only the original "12Z". the solution is to simply just rotate after removing the response.

another related issue involves the "components" kwarg in rotate(). I don't think this is necessary anymore in obspy, and in fact it seems to cause a lot of additional issues. rotating frames works fine just with st.rotate(method="->ZNE", inventory=inv)