Added clone support for network arrays. Also modified clone(ensemble) methods in origins and terminations to clone(node) - uses Node class instead of Ensemble class.
Merge branch '1.4' of https://github.com/ctn-waterloo/nengo into 1.4
Fixed bug with network array cloning.
Network array terminations were not being cloned properly. Now they are.
Network array nodes are also being deep copied now (this is the list of nodes internal to NetworkArrayImpl - different from the one in NetworkImpl)
Fixed drag scrolling for maximized windows (issue #370)
Merge branch '1.4'