Fix parsing logic of function parameters with closing parentheses

Currently a function with parameter which have parentheses is wrongly parsed. As soon as a closing parentheses is encountered, the parsing logic assumes end state for the function parameter. For example, given 
`concat(sum(), 10)` then `sum(` is treated as first parameter. This is wrong parsing logic.

A parameter should be treated completely parsed only when a `,` or, the last `)` is encountered ( that is groupParen == 0)

json-path/src/main/java/com/jayway/jsonpath/internal/path/PathCompiler.java

@@ -353,6 +353,7 @@ public class PathCompiler {
                     if (0 > groupParen || priorChar == '(') {
                         parameter.append(c);
                     }
+                    if(groupParen > 0) break;
                 case COMMA:
                     // In this state we've reach the end of a function parameter and we can pass along the parameter string
                     // to the parser