Full support of all gitignore features

[tkonolige]

Dbignore lacks the following:

• Correct directory handling.

If the pattern ends with a slash, it is removed for the purpose of the following description, but it would only find a match with a directory. In other words, foo/ will match a directory foo and paths underneath it, but will not match a regular file or a symbolic link foo (this is consistent with the way how pathspec works in general in Git).

• Include excluded files.

An optional prefix "!" which negates the pattern; any matching file excluded by a previous pattern will become included again. It is not possible to re-include a file if a parent directory of that file is excluded. Git doesn't list excluded directories for performance reasons, so any patterns on contained files have no effect, no matter where they are defined. Put a backslash ("") in front of the first "!" for patterns that begin with a literal "!", for example, "!important!.txt".

[tkonolige]

As #8 points out, fnmatch should be used for globbing.