automate updating the docs

add a test for --version

use less specific versions

Tweaks

edit comments

fix typo

upgrade usage to 1.0.0

Update the readme.

Changed to just run the tests against stable.

remove project name validation

add a coveralls.io link

Test against both the dev and stable SDKs.

update authors; rev version

Updated polymerapp for latest packages

Polymer < 0.15.4 returns warnings during build.

switch to the new travis dart configuration

Updated polymerapp template for polymer 0.15.5 and paper_elements
0.6.1. The template now uses key-up event because valueChanged was not
working with the latest paper_elements package.