Fix amazon.com.br links not working

[marciogranzotto]

Amazon Brazil's link is amazon.com.br, but setting AMAZON_TLD=com.br doesn't work because it contains a . that needs to be escaped on regex, and the fullURLRegex didn't match the 3rd group (.com.br).

To fix it I:

• added a regex escape function to build the amazon URL
• changed the 3rd regex group for fullURLRegex to match from 1 to 2 times

[LucaTNT]

Thanks for the PR!

Just a question: shouldn't the regExpEscape() function be applied to the regexp in the definition of rawUrlRegex constant rather than to the buildAmazonUrl() function?