Support suda:// and other schemes

[sevmonster]

Filenames with schemes such as suda:// (used by vim-suda) will not work with vim-lastplace because they are not glob-able. It would make sense to jump to last edit position for some of these files. Having a list of schemes to enable vim-lastplace on would be beneficial.

Implemented in #37.

There is an issue where the cursor is moved up one line but otherwise works with suda:// schemes as is my use-case. I assume this is a vim-suda problem.