include and exclude filters to the output

[rizsotto]

Would be nice to filter out entries from the final output.

• Can be done by explicitly name files or directories which can be omited.
• Can be done by explicitly name files or directories to include in the output.

This requires to define precendency fot these operations. The semantic can favour the include or the exclude. (Picking the exclude as stronger rule as it would fit more to the usage I've seen.)

• Specify --include /src --exclude /src/test will result all elements from /src which are not in the /src/test directories.
• Specify -exclude /src --include /src/service will filter out all sources ftom /src directories, even if they are in the requested /src/service directory.