[#1977] Implement a redeemablePromise
Update Eclipse debug documentation

As discussed in https://groups.google.com/forum/#!topic/play-framework/O2aoDOgY8Ac
Merge pull request #2034 from fernandoacorreia/ide-debug-doc

Update Eclipse debug documentation
Merge pull request #1999 from baloo/improvements/1977-Promise.empty

Added RedeemablePromise to the Java API, which is a Promise object that can be redeemed later with a value or exception. This gives Play's Java API an equivalent to Java 8's CompletableFuture or Scala's Promise.
Remove erroneous javadoc invocation

When I moved to use the SBT 0.13 javadoc API instead of us invoking
javadoc directly, I accidentally left the old invocation of javadoc in
there, which always failed.

Fixes #2040
avoid array copy unless necessary, to improve performance
mark InputStream.read as blocking
Merge pull request #2036 from kruckenb/master

In Enumerator.fromStream, avoid copying input array where possible.
Merge pull request #2040 from jroper/2040-fix-javadoc

[error] javadoc: error - Illegal package name: "2.3-SNAPSHOT"
Merge remote-tracking branch 'upstream/master'