Add an option to ignore generated files?

[ainar-g]

Go code has a convention on how to mark code as generated. Perhaps, some other languages too. It would be nice to be able to exclude generated code from the statistics.

Alternatively, there could be an option to exclude files by a regexp of the file content, so that people could do something like:

gocloc --exclude-containing='^// Code generated .* DO NOT EDIT\.$' ./src/