denote utf-8 encoding

This fixes an issue there the ruby interpreter runs into a syntax error because it can't interpret the unicode symbol for "greater than or equal":
```
/Users/mrtazz/bin/vimr:17: invalid multibyte char (US-ASCII)
/Users/mrtazz/bin/vimr:14: syntax error, unexpected $end, expecting tSTRING_CONTENT or tSTRING_DBEG or tSTRING_DVAR or tSTRING_END
```
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Merge pull request #154 from mrtazz/patch-1

denote utf-8 encoding
Merge pull request #155 from qvacua/file-browser-arrow-keys

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