Log Message:
Update to 1.0.4

Changelog:
    Don't consume key release events [#52]
    Improve hankaku katakana conversion [#51]
    Use the same typing rule in dict-edit mode [#50]
    Add abort-to-latin and abort-to-latin-unhandled command [#48]
    Add more z-* shortcuts from DDSKK
    Fix memory leak caused by Vala array conversion
    Bump build requirements (glib >= 2.36, valadoc >= 0.40)