Fix header title scale transform for longer titles

The current custom resizing of the header title works great for short titles like "Title", but if you put in anything longer, it creates weird spacing on the left of the title because of the transform origin being in the center. By changing the transform origin to the left edge, the left margin remains consistent.
Merge pull request #5 from cletusw/patch-1

Fix header title scale transform for longer titles
Docs: add not of .content
Fixes #8. Remove background color from core-toolbar
Merge pull request #9 from robdodson/transparent-demo

Fixes #8. Remove background color from core-toolbar
polymer.html should be included in the element level, not in the app level
update iconset path.
demo8: size icon via css not size attribute
Merge pull request #10 from zenorocha/patch-1

polymer.html should be included in the element level, not in the app level
unprefixed css should come last
Merge pull request #13 from Polymer/fixtransforms

Unprefixed css should come last
Add warning about needing explicit height