Add -sbt-latest, uses latest sbt release, & test.
Kill unused java_home.
Strip MaxPermSize for Java 8+.
Move stub_java out of sbt_anticipating.

This is so that java can be stubbed differently.
Stub java -version as well, in stub_java.
Stub only args echo in config file, no -version.
Stub java -version, for -sbt-create.
Add sbt_{expect,reject}ing_echo, no -version stubbing.
Fix jvmopts tests, don't stub -version.
Merge pull request #80 from dwijnand/no-more-max-perm-size-notice-spam

Remove MaxPermSize notice spam.
Organized jvm opts a little.
Rename to -sbt-force-latest.
Add -sbt-force-latest to the help output.
Rename to -sbt-force-latest in test too..
Add -sbt-dev to the help output.
Add -debug-inc to the help output.
Merge commit 'refs/pull/77/head'; commit 'refs/pull/81/head' into merge