Allow unnamed collection of paths

Paths will be named by replacing / with _
Documented ability to not name paths
Merge pull request #14 from timabell/unnamed-paths

Seems like a good feature, merging.  Thanks for the PR
Put the summary data file in the shots/ folder

To keep all the output together.
Updated readme to reflect new data.txt path
Merge pull request #15 from timabell/move-data-file

Put the summary data file in the shots/ folder
Added ruby script to create bootstrapped gallery of all the screenshots.
Gallery will now include multiple sizes, and the calculated delta in bytes
Bootstrap.css now included in project, you don't need access to the internet to view the gallery.
Update README.md

Added basic changelog by running git log | grep 'Merge pull'
Now generates thumbnails to make loading the gallery page sane.
Updated README with dependencies for ubuntu.
Merge pull request #18 from ecometrica/gallery

Gallery
Merge branch 'master' into crop-images

Conflicts:
	Rakefile
	config.yaml