Change calculateSignature to make it unique #137

Now we can have collisions because method arguments must be fully qualified too, for example:
my.package.MyClass.myMethod(java.lang.Integer).
Must be fixed with #135 because calculateSignature is defined in MetricsReloaded module and it is core function to identify methods.
Needs to fix getHumanReadableName because it must be used as output to user but calls calculateSignates which is not user-friendly.
See #90