Bytes.empty should have type Bytes instead of Bytes1
Merge pull request #81 from fthomas/patch-1

Bytes.empty should have type Bytes instead of Bytes1
Add test for process1.window
Also test window(1)
Do not throw if window is called with n < 1

This would otherwise throw an UnsupportedOperationException because of Vector().tail:
Process.range(0,5).window(0).runLog.run
Behave similar to chunk and throw a RuntimeException if the window size is not positive.
pipe and tee properly preserve errors now
updated README.md
Merge pull request #82 from fthomas/test-window

Tests for process1.window
Merge branch 'master' into topic/subprocess
Use a working linesIn transducer