Created rule "File"

This rule checks if the given data is a path of a regular file or not.
Created rule "Exists"

This rule checks if the given data is a path of a regular file or
directory.
Created rule "SymbolicLink"

This rule checks if the given data is a path of a valid symbolic link.
Created rule "Readable".

This rule checks if the given data is a file exists and is readable.
Created rule "Writable".

This rule checks if the given data is a file exists and is writable.
Created rule "Uploaded"

This rule checks if the given data is a file was uploaded via HTTP POST.
Merge pull request #102 from Respect/files

Improved rules of files