Prep for 0.9.0-rc1 release: bump version and add KEYS file for artifact verification.
update changelog for 0.9.0-rc1, prep for rc2
Fix broken JAR_JVM_OPTS

An extra space was being included before -Dstorm.jar when no JAR_JVM_OPTS was specified.. this was causing an exception from java for class not found
Fixing STORM_JAR_JVM_OPTS
Using @xumingming recommendation
Merge pull request #683 from roadkill001/master

Fix for STORM_JAR_JVM_OPTS which is currently broken when STORM_JAR_JVM_OPTS is not specified