MX7 Support Added (bugfixes)

This latest update adds support for MX7 by removing the MX8 specific functionality; specifically and imageNew.

To provide this support a "cacheDirectory" attribute was added, this is now a required field and should be a relative path from the webroot to the desired storage directory.

e.g. you create a directory under your images folder to use as the temporary storage for your chart images.

http:///images/chartcache/

The value you pass to the cachDirectory attribute would be: "/images/chartcache/".

Another new attribute "maxCacheSize" was added to allow you to specify how many images you want to keep in the cache. The default is 10.