Ensure graceful handling of UTF-8 characters

Forcing the encoding to UTF-8 ensures that vim, when started in a
non-UTF-8 environment, can gracefully handle the presence of UTF-8
characters in the file. Instead of generating errors, extended
characters will be transliterated.
Merge pull request #28 from elliterate/handle_utf8_chars

Ensure graceful handling of UTF-8 characters
Remove ss and vv keybindings, which conflict with core vim.

"ss" is "substitute this character for 's' and drop into insert mode".
Merge pull request #29 from chinigo/remove_conflicting_split_bindings

Remove ss and vv keybindings, which conflict with core vim.