shorten 6.x-1.7

This bug-fix release is recommended for everyone.

Changes from 6.x-1.6

• #767712: Use non aliased path for shortening. (thanks zyxware)
• When cURL fails, it returns FALSE. Prevent that FALSE from being run through string functions.
• Make the "www instead of http" setting work with https
• If the "www instead of http" setting is enabled, don't add "www" if the URL already begins with "www"
• #736334: Error message (Fixed another problem with cURL failing very early due to bad server configuration)
• #786684: Upgrade bit.ly/j.mp API to v3 (thanks jtolj)