Supports encoding of utf8 at ABSTRACT_FROM.

This is a patch to get the abstract from the NAME of the pod of modules written in utf8.
Changed so that it may change encoding, only when pod is encoded by utf8.
oops 'use utf8' is supported 5.8 or above.
Not hardcoded to UTF-8 encoding of the pod.
Merge pull request #127 from magnolia-k/utf8_ABSTRACT_FROM

Supports encoding of utf8 at ABSTRACT_FROM.