MULE-7123: Making non-serializable fields transient
MULE-7123: Adding support to still serialize transient fields when they happen to be Serializable
MULE-7123: Testing each exception in its own test and adding more meaningful names
Merge pull request #190 from mulesoft/MULE-7123

MULE-7123: Making non-serializable fields transient so that all MuleExceptions can be stored