Prevent the Go command completion from jumbling up the shell prompt on
errors by setting the Writer of the standard lib default log.Logger to
ioutil.Discard unless the system environment variable `GOCOMP_VERBOSE`
has been explicitly set to "1" (e.g. for debugging purposes).
Fixes#139
Ensure that the components of the `testing` package that rely on calling
`os.Exit` remain functional and any test failures are actually reported
back after the `monkey.Patch` in the `gocomplete.Example` test.
Fix#135
This simplifies the prediction logic writing, the predictor
doesn't need to filter our according to line matching, instead
it returns everything and the filtering is done at the end.
This does not break current behavior.