Store advices in array

[gcao]

Advices are stored in an array. Whenever a method is created, the whole array is checked to find the advices that
are applicable to it. Those applicable advices are used to construct the new method. This provides a lot
flexibilities but can be a performance burden.

[gcao]

One way to improve performance is to use array to store advices that use regular expression. Advices specific to
methods are stored in hash. (Do this only when performance is proved to be a problem in real world scenarios)