Argument check should support prefix matching

[mwgamble]

Sometimes it's not feasible or desirable to list out all possible arguments. For example, sometimes the number of arguments is variable throughout the script, and I only want to mock it once. In that case it would be ideal if the stubbing functionality could handle matching on prefixes rather than the entire command string.

[toote]

Looks like you are describing the same as #15 so I will close this one as a duplicate