sbt: the rebel cut

An alternative script for running sbt 0.10. There's also a template project sbt coming together, but it's unfinished. However the runner is quite useful already.

./sbt -help

Usage: sbt [options]

  -help           prints this message
  -nocolor        disable ANSI color codes
  -debug          set sbt log level to debug
  -sbtdir <path>  location of global settings and plugins (default: ~/.sbt)
     -ivy <path>  local Ivy repository (default: ~/.ivy2)
  -shared <path>  shared sbt boot directory (default: none, no sharing)

  # setting scala version
  -28           set scala version to 2.8.1
  -29           set scala version to 2.9.0-1
  -210          set scala version to 2.10.0-SNAPSHOT
  -local <path> set scala version to local installation at path

  # passing options to jvm
  JAVA_OPTS     environment variable  # default: "-Dfile.encoding=UTF8"
  SBT_OPTS      environment variable  # default: "-XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=512m -Xmx2g -Xss2m"
  -Dkey=val     pass -Dkey=val directly to the jvm
  -J-X          pass option -X directly to the jvm (-J is stripped)

The defaults given for JAVA_OPTS and SBT_OPTS are only used if the
corresponding variable is unset. In the case of a duplicated option,
SBT_OPTS takes precedence over JAVA_OPTS, and command line options
take precedence over both.