Simplifying condition statement

Removing code that is not needed or never gets accessed
Make custom quote header regex check more flexible

preg_match('/(>+)$/s', $line) trumps the quote header regex check.

The problem is that there are a lot email clients who don't use ">".
Merge pull request #9 from creativej/master

Fix a problem where custom quote regex won't work because the quote doesn't has '>'