Added normalize() method to taxii_services.utils that normalizes all whitespace of an input string to one space and strips leading/trailing whitespace
Normalized all whitespace to logging calls which contained values originating from user input. Fixes #28 and Fixes #20
Added logging call to discovery service handler. Closes #27
Added logging call for when TAXII header validation fails. Closes #26
Fixed issue where x509 certificate validation threw a 500 server error on failure. Fixes #31
Removed unneccesary call to get_components() in validators.py. Closes #23
Updated certificate validation error messages
Merge pull request #34 from TAXIIProject/fixes_002

Merging fixes_002 branch into master