Move Go code to a directory.
Split Go code into multiple files.
Move code from shenmeci.go to cedict.go.

This is an effort to separate concerns in different files.
Move code from shenmeci.go to web.go.
Adds support for Full-Text Search.

We use FTS to search for terms when the segmentation returns no results. This will likely happen when we search for terms in English.

Closes #4.
Add logging messages.