add sbt-0.12.3 support
Merge pull request #40 from xuwei-k/sbt0.12.3

add sbt-0.12.3 support
Always vendor JDK
Merge pull request #41 from heroku/vendorjdk

Always vendor JDK
Skip logging
skip doc generation
remove erroneous version from Heroku plugin
Merge pull request #43 from heroku/no-doc-gen

No doc gen
Attempt to clean up Ivy cache after SBT build.
try to fix relative path
more extraneous crap deleted
node, npm, requirejs
Helps if I install a version of node/npm that Heroku actually has.
variable mistake
Bad method invocation because I'm blind and can't see parentheses vs
braces.
I think I made a mistake by not exporting the env variable for
requirejs.
Eliminate SBT after compiling.
Merge branch 'master' of https://github.com/zten/heroku-buildpack-scala
Fixing my own merge screwup.