Fixes for appostrophe and single quotes not matching

This is a fix for #42 and also contains fixes for another that talks about terms not being properly escaped.

I takes characters that could be used as apostrophes and adds extra search terms to the main search so that posts containing the same word, but with a slightly different symbol is matched.

```
Apostrophe U+0027 '
Modifier Letter Apostrophe U+02BC ʼ
Right Single Quote U+2019 ’
Prime U+2032 ′
```