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
Release 0.9.0-rc2
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