Extended string concatenation code to handle arguments in 'new
StringBuilder()' constructer, ie  'new StringBuilder("str")' or 'new
StringBuilder(String.valueof(varName))'
Extended convertInvoke to handle calls to StringBuilder constructor with
arguments, ie: new StringBuilder("str")  or  new
StringBuilder(String.valueOf(var))
Merge pull request #29 from riboribo/master

Extended convertInvoke to support more StringBuilder formats