When the user calls install from the command line, a dependency will be added to the project's package.json. However, this will reformat that file. Should now perform more like user expectations mentioned in #12.

Avoid invalid relative paths on Windows, fixes the latest issue mentioned in #12.

Fixed copyFile() - was broken after replacing vibe.d's file handling with Phobos' "File".

Renamed all the "vibe" package to "vibecompat" to avoid conflicts.