Convert image 4.7

Convert image v2.7 changes:

Now using improved code to download hot linked images.

Convert image v2.6 changes:

Fixed issue with very long file names.

Convert image v2.4 changes:

Now using XF framework for database and file system. Removed compress JPG image option.

Convert image v2.5 changes:

Removed compress variable which is no longer available.

Convert image v2.3 changes:

Added the option to compress JPG images.

Convert image v2.2 changes:

Fixed issue where a double quote in the image URL caused a server error.

Convert image v2.1 changes:

Added code to prevent very large animated GIFs from timing out during thumbnail creation.

Convert image v2.0 changes:

Fixed issue where getimagesize would throw an error on some servers.

Convert image v1.9 changes:

Now supports XF v2.0 and v2.1.

Convert image v1.8 changes:

Now using Guzzle for HTTP requests.

Convert image v1.7 changes:

Images which exceed width and height limits are now properly resized.