some changes done over the weekend testing how performance would improve if we cached urls with a simple LruCache implementation.
conflict resolved
updated common README
Split 'common/' into commit 'fe26b979b1f8eb660ad139ba26f7c7acb83f0694'

git-subtree-dir: common
git-subtree-mainline: 3035221defb68b02432d38c4558b1c7127e84997
git-subtree-split: fe26b979b1f8eb660ad139ba26f7c7acb83f0694
more 'componentization' of javax and seamless libraries.