bump packages for feature parity with Heroku

Taken straight from https://github.com/heroku/stack-images/blob/master/bin/cedar-14.sh#L16-L55,
this bumps us up to feature parity with Heroku's beta cedar stack.
Interesting to note that they removed Java 6 support.

I intentionally left in pigz due to 304a97d, though I would argue that
Heroku does not have this package installed, so we shouldn't either.

Signed-off-by: Matthew Fisher <matthewf@opdemand.com>
Merge pull request #6 from bacongobbler/update-packages

bump packages for feature parity with heroku
remove call to java

Java was removed with 577fb04, so this call will return

    ./cedar.sh: line 51: java: command not found

Removing the call to java fixes this issue.