Fixes lightblue-platform/lightblue-rest#16: use StrSubstitutor.replaceSystemProperties(String):String to replace system props
Added commons-lang dependency to util
Merge pull request #163 from jewzaam/pr-system-properties

Fixes lightblue-platform/lightblue-rest#16: use StrSubstitutor.replaceSy...
Merge remote-tracking branch 'origin/master' into feature-association