FIX #211 and #232. Checking $java_args[@] for memory settings, too.

[muuki88]

Finally. This was a bit tricky, but should be fixed now. @jsuereth you may want to add this to the sbt-launcher-package project, too.

@kardapoltsev can you review/test please? I just checked with Ubuntu 14.04 and play.

[muuki88]

After thinking a bit about this issue, I propose to remove the -mem option. This adds no value, but confusion. -J-Xms512m -J-Xmx512m is understandable for most of the java/scala developers, -mem 512 only for a few.

The bash script will get a bit cleaner and we can focus on memory checks regarding java_args and java_opts, so the java_opts override correctly the java_args if specified. What do you think @jsuereth , @kardapoltsev , @aparkinson ?

[kardapoltsev]

I'm fully agree with removing -mem option.