etc/sysconfig/repose was not being honored & java opts

Added mechanism for adding options to pass to the JVM, and fixed issue
where the external sysconfig file values were being overriden by the
defaults set in the init script
Fix for regression.
Made a comment more specific, in order to prevent futures issues.
Merge pull request #485 from rackerlabs/sethbrayman

Sethbrayman
Merge branch 'master' of git://github.com/rackerlabs/repose