[Classpathx] Classpathx servletapi does not compile with java8

[Gábor Boskovits]

Dear classpathx developers,

I discovered, that classpathx servletapi 3.0 does not compile with java8.

The problem is that java8 added a method to the Map interface:

boolean remove(Object,Object), which conflicts with

Object remove(Object,Object) method in:

source/javax/servlet/jsp/el/ImplicitObjectELResolver.java;

ImplicitObjectELResolver::ScopeMap::remove

how should we fix this problem?