remove the copy command from the vim and textmate targets

`vim/ftplugin/html/sparkup.py` and
`TextMate/Sparkup.tmbundle/Support/sparkup.py` are now stored in the
repo as symlinks to the toplevel `sparkup.py` and thus cause `make vim`
and `make textmate` to fail when trying to copy it.
create toplevel symlinks for ftplugin and doc

tpope's vim-pathogen expects to find the ftplugin directory at the top
level.  use `make vim-pathogen` to generate symbolic links to the
ftplugin and doc directories.
dont recreate sparkup.txt unless out-of-date
Merge pull request #89 from nixon/pathogen

Make it easy to install for pathogen users