Don't load Pins "in background" when lightbox is active.

Remove the scroll event handler when lightbox is active, so pins are
not loaded in background breaking the page layout.
Generate thumbnails when image is being saved

Too lax unique constraints for Thumbnail coped with "on demand" thumbnail
generation may leave database in inconsistent state where two thumbnail for
the same size are saved. We should be able to prevent that from happening
by generating all thumbnails when we save the image. Should fix #24, but
I can't figure out a way to actually test it.
Pin factory-boy dependency on 1.3.x branch

Factory Boy 2.0 have removed the "extracted_key" keyword argument from
post_generation() hook. Until we can update tests to work with 2.0 make
dependency on 1.3.x branch. In turn, the update got stalled by a bug
in Factory Boy (https://github.com/rbarrois/factory_boy/issues/53).
Update version to 1.1.0 in preparation for the release
Merge branch 'release/1.1.0'
Fixed missing punctuation in messages css.
Change in license back to our roots, Simplified BSD. Updates to Readme pointing to docker, our prefered method of deployment.
Updating the readme.
A few more minor readme updates.
Adding rss feed for latest pins.
Finish up feed implementation.
Update to latest requirements including official taggit
Updated requirements to use original repos in many cases and pull
everything from pypi instead of pulling from git repos.
Had to revert tastypie to a previous version due to some issues with
latest.
Update feeds to meet PEP requirements and minor adjustments to base.html
Updated requirements and other items in preps of new pinry version
Added Original URL and Pin URL to lightbox of items.
Fix logo URL
Move to bootstrap 3, better design, move all vendor items local.
Hide passwords from view on forms