Initial commit adding lxml to required libraries
Changes necessary to get nosetests working

There was circular dependency I didn't feel like tracking down,
so I moved the twitter lib import line to only execute at runtime.
I didn't wish to completely chop up the directory structure so that
was my fix.
Eliminated horrible regular expression parsing!

Split apart the image meta data extraction from the main saving
function so it could be tested properly.  Tests passing based on
stored resource.
Improved image saving process and added testing