document.readyState on IE 10 is busted on 'interactive', remove check in boot

Documentation of readyState issue: https://github.com/mobify/mobifyjs/issues/136
export `path` in HTMLImports, revise sourceMap tagging for eval'd scripts
test: update karma config
Update README.md
correct scope function argument.
make script execution specific to js
Merge pull request #16 from pennyfx/script-execution-fix

Script tag execution should be more specific to javascript
block obviously non-js script tags from being parsed
more specific preloader selectors for script tags that actually have a src attribute
Merge pull request #19 from secretrobotron/script-safe-parser

block obviously non-js script tags from being parsed
Merge pull request #21 from secretrobotron/preloader-script-precaution

more specific preloader selectors for script tags that have a [src]
Fixes #22
include template script test
instanceof has lower precedence than !
remove test that fails on FF. Scripts from imports do not execute on FF due to https://www.w3.org/Bugs/Public/show_bug.cgi?id=11323
Reverted fix for #22, blocked on https://code.google.com/p/chromium/issues/detail?id=257221
create build manifest
Merge pull request #23 from Polymer/master

7/11 master -> stable