GROOVY-6393: groovysh: load command without parsing xml and invoking classloader
Refactor Groovysh Tests: use assert
GROOVY-6499: Only display MetaClassImpl methods after prefix
GROOVY-6397: Prefix '\' to all commands
GROOVY-6397 replace backslash as prefix with colon
Merge pull request #305 from tkruse/groovy6499

Groovy6499
Merge pull request #304 from tkruse/groovy6397

GROOVY-6397: Prefix ':' to all commands (short and long)
Merge pull request #306 from tkruse/groovy6393

GROOVY-6393: groovysh: load command without parsing xml