Re-add core-layout until elements that rely on it, don't

docs stuff still uses it
gp.sh saves bower info in gh-pages branch to enable future use of bower update
Merge pull request #26 from cletusw/bowerUpdate

gp.sh saves bower info in gh-pages branch to enable future use of bower update
always update bigstraw version
pull more things
Removed suprious handlebarness.
Merge pull request #28 from Polymer/fixes

Removed suprious handlebarness.
core-sampler deprecated, use core-elements demo instead
update chai and mocha
explicitly release the blessed set of repos
remove deprecated core-sampler
Add core-signals
Add paper elements and a few others to the repo configs

Fixes #30
Closes #31