[AndyB] Amazon parser all 4.4

Now parses Amazon a.co short URLs.

Now supports amzn.to URL shortener.

Updated regex.

Improved detection of Amazon links.

Fixed issue with .com.br and .com.mx regex.

• Added 'Start post ID' to options page.

• Fixed regex to properly get Amazon short links.

Fixed parsing issue.

• Fixed issue with Amazon non-product URL's.

Amazon parser all v3.1 changes:

• Fixed issue with options variables.