MULE-7516 Expand MEL tests to cover all optimisers and revert to using DynamicOptimizer as default
MULE-7516: Update MVEL version to include ASM optimizer fixes
Removed testing on the undocumented "ASM" optimizer, which has several unsupported expressions (dynamic optimizer falls back correctly on unsupported expressions).
Fixed expected exception on expresion failute test.
Merge pull request #615 from mulesoft/MULE-7516

Mule 7516 - Add tests and reenable MVEL dynamic compilation optimizer