Fix typos.
Add nio File operations

The functionality mirrors the functionality in the io package with the exception that all operations are performed asynchronously using the java nio2  framework.
Less precise types for `halt` and `empty`
Fix spelling of "supersede"
Fix compilation for Scala 2.11
Merge pull request #217 from radekm/fix-for-scala-2.11

Fix compilation for Scala 2.11
Merge pull request #216 from radekm/less-precise-types-halt-empty

Less precise types for `halt` and `empty`
Scaladocs on empty
Allow type parameters to empty
Add "import scalaz.stream._" to sbt's initialCommands
switch to scala 2.11.2
Update README.md
Some scaladoc cleanups
Implement scan1 in terms of scan
Merge pull request #219 from fthomas/scan1

Implement scan1 in terms of scan
Simplify process1.intersperse
Replace 'await1 ... repeat' with 'id'
Fix typo
Minor cleanups
Replace await1[A].flatMap with receive1