Allow wildcards when configuring namespaced linters

Now that `scss-lint` has support for namespaced linters (the first being
`Compass::PropertyWithMixin`), it would be convenient if you could
enable/disable entire namespaces with a few lines of configuration,
instead of having to manually enable everything.

Add support for configuring all linters matching a pattern such as
`Compass::*`.

Change-Id: I65d96bbee78e53952dad1d17c487ba7db225bbf1
Reviewed-on: https://gerrit.causes.com/31535
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>