add xml validation
re-add notifications
dont use backticks
after much ado - make grep quiet
Remove whitespace from .travis.yml
Clean up output of test_idioms.sh script
Rename example IOC file from .ioc.xml to .ioc
Ignore a copy of stix-validator in this directory
Specify exact version of python-stix to install
Account for bug in recent version of python-stix.

See STIXProject/python-stix#220
Make full MAEC example schema-valid
Merge pull request #133 from STIXProject/validate-idioms

Validate idioms