luna_pinyin*: enable custom_phrase dict.
luna_pinyin: open custom_phrase as stabledb.

so that user can edit the file without running into conflits.
luna_pinyin*: disable making sentence with custom phrases.
wubi86: set max_code_length: 4
essay: 「仙臺」「雅築」「擊筑」
Merge pull request #9 from kunki/master

修正錯詞