allow absolute paths with : and \ (windows support)
allow windows absolute paths

Don't replace all the slashes with '.'s if the path
appears to be a windows absolute path (starts with a drive letter and
is on a platform where the path separator is '\').
fix (makeRelativePath): strip \ and / when resolving paths

After removing a subpath when resolving a relative path,
look for a path separator (/ or \, regardless of platform), and
remove it if necessary. This prevents mixed paths (eg:
c:\initial\folder/added/path) from being resolved with a leftover / on
the front on systems with \ as the path separator (windows).
Merge pull request #73 from gameclosure/feature-windows-paths-recreated

Feature windows paths recreated