Fix for url loading of images in ofImage::loadImage

Re discussion in #3304, ofImage::loadImage did not work on https.
Switched from using a substring check for "http" in the filename to
using Poco::URI to detect http or https in the scheme.
Updaing changelog
"Bug fix" for regex example

The order of attributes on the table tag in the HTML returned from
google has changed slightly.  width now comes before style.  Tested
in 0.8.4 and in master on win codeblocks 12.11.
update PG to latest commit
As per @kylemcdonald's suggestion, regex is attribute order-independent
Merge pull request #3310 from mikewesthad/bug-fix-regex-example

"Bug fix" for regex example
Merge pull request #3308 from mikewesthad/bugfix-loadImage-HTTPS

Fix for url loading of images in ofImage::loadImage