[MVEL-309]Fix url of issue link in error message
MVEL-308 fix NPEs during ASM optimization

Conflicts:
	src/test/java/org/mule/mvel2/tests/core/PropertyAccessTests.java
MVEL-314 ASMOptimizer fails to access non-primitive static fields

Conflicts:
	src/test/java/org/mule/mvel2/tests/core/PropertyAccessTests.java
MVEL-313 ASMOptimizer fails when invoking method with negative integer parameter