Fixes conversion of si/shi to し
Fixes n[next character] conversion
Fixed conversion of じゃ, じゅ, じょ
Fixed conversion of り, る, れ, ゐ, ゑ
Fixed ふ conversion
Fixed conversion of ー
Merge pull request #6 from seifip/patch-1

Fixes conversion of し, じゃ, じゅ, じょ, り, る, れ, ゐ, ゑ, ふ, ー and of n[next character]