prevent experiment names with spaces

RELEASE_NOTES.txt

 Release 2.3.1 (XX/YY/2019)
 =============================
 - Added system LDAP utilities for verifying and creating groups
-- Prevented core files from being uploaded
 - Added support for retrieving single processing job stage via the --stage
   option for the get-processing-job command
+- Prevented core files from being uploaded
+- Prevented creation of experiment names with spaces
 
 Release 2.3.0 (04/15/2019)
 =============================