Fixed a bug with the regexp checking. The last '/' made it system specific and wasn't working on Windows because Node path resolves Windows paths with '\' instead of '/'.
Fixed a bug with force option. Anything else than {force: false} was thought to be true. For example {force: 'false'} was actually true.
Merge pull request #6 from peter-vilja/bugfix

Fixed a bug with the Regexp checking and a bug with force option.