Remove the root path correctly under Windows
addRootSlash not always wanted

Adding the first slash is not something we always want
New option "addRootPath" added

The option "addRootPath" (true by default) has been added in order to add a root path ('/').
The new "addRootPath" option has been added
Update README.md
The "addRootSlash" has been added
Fixing addRootSlash default and adding test
Bumping version