Results 2 issues of Ryoto Saito

fixes #23 that `htmlBody` and `textBody` were not decoded even `Content-Transfer-Encoding` was specified.

``` Compiled Ruleset @602 Compiled Rule --atommatch: spec [2, 2] --memmatch: spec [1, 1] jump [L135, [0], [], []] --guard:L135: spec [1, 1] jump [L128, [0], [], []] --body:L128: spec...