WildTypePattern: fix hashCode and toString methods

WildTypePattern: fix hashCode and toString methods

Especially 'hashCode' did not correspond to 'equals', disregarding
several fields, array dimension information being only one of them. This
led to parts of pointcuts being ignored, because they were regarded as
duplicates. Example:

execution(Foo* *(..)) && !execution(Foo*[] *(..))

Here, the negated pattern was falsely regarded as equal to the first
pattern, leading to an "A && !A" situation, i.e. no match at all.

Furthermore, 'toString' did not print array strings, i.e. instead of
"Foo*[][]" something like "Foo*" was printed. This false information was
also present in annotations generated by the weaver.

FuzzilyMatchingAspect was adjusted to actually match exactly once, as
expected, for the "Foo*" return types, i.e. exclusions for the array
return types have been added.

Relates to #24.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>