Description of problem:
Nakaguro ("ã»") is a fairly common input character in Japanese
(indeed it even appears on the Kana layout of a Japanese layout)
yet the default scim-anthy Romaji style doesn't allow one to input
it easily

Steps to Reproduce:
1. Press '/' in default romaji style.
  
Actual results:
1. "ï¼" appears.

Expected results:
1. "ã»" to appear.

Additional info:
The map '/' --> "ã»" seems to be standard for most commonly used
Japanese Romaji Input styles: including most of the other Romaji
input styles included with scim-anthy.  Not sure if the best solution
is to default to one of those style or to modify the default style
to give nakaguro.