v0.4.0

• (1,1,1)-maxpoolings are now implied in Conv Node constructors → less redundant code in network models that don't use conv-pool layer stacks (917bdea, c81294e)
• New Add Node type for merging two network branches (cd87b78)
• Use the short form nm for the elektronn2.neuromancer module throughout examples and docs (8a412d0)