Merge pull request #84 from adriaanm/master

merge 2.10.x
* Force sbt 0.12.2 to be used
* Added S3 plugin
* Adapted distribution OS junk to just publish to S3
* uses downloads.typesafe.com for files
* Files published depend on OS used to publish.

Conflicts:
	project/build.properties
Attempt to write HTML index of what files were added for scriptable downloads later.
Remove anonying <br/> junk.
update to sbt-s3 plugin 0.4
s3credentials file path
Merge branch '2.10.x'