Fix failing tests and speed up Travis builds

This should yield another 30-second speed up. Nobody looks
at the output of those anyway. We might want bring back gofmt later
and actually fail the build if source is not formatted.

This should decrease test runtime to about 30 seconds.

This is an attempt to get Travis working again.

This removes the annoying warning printed by "go install ./...".

This silences "go install ./...". For some reason it started
complaining with go 1.4.2.

p2p: disable encryption handshake, enable log events

Implement command line argument to set the amount miner threads

Cut, Copy, Undo and Redo working in webview

This should prevent connection drops.

The diff is a bit bigger than expected because the protocol handshake
logic has moved out of Peer. This is necessary because the protocol
handshake will have custom framing in the final protocol.