bug fixing, flag support

Adding support for various jibx flags through boolean values
exposed in JIBXBinding attribute :
verbose = to enable/disable the verbose flag
verify = to enable/disable BCEL verification
overrideErrors = to enable/disable overriding of code generation
error handling
skipBindValidation = to enable/disable skipping of binding
validation
trackBranches = to enable/disable tracking of
source code location
testLoading = to enable/disable loading test of modified
classes

Force compiled class cleanup prior to the build task to run
to avoid having bound classes (which are stored in build/classes)
to be bound again on a new build (workaround for not supporting
well incremental build)

Change-Id: I155c3ebffd479a85e82ae3e84179f2c3ecb70e25