GROOVY-6754 Fix test not terminating in IntelliJ (not sure why it terminates with gradle)
Fix: '::' as command prefix invalid.
GROOVY-6790: groovysh: fix startup does not load groovysh.rc
GROOVY-6790, GROOVY-6754: use constant rather than literal
This change does only affect branches that have GROOVY-6754
(i.e. not GROOVY_2_3_0)
Merge pull request #417 from tkruse/fix_colon_commands

GROOVY-6790 Fix groovysh startup with groovysh.rc