Fix polymer 3

[jorgecasar]

Changes:

marked-element

• is contained within @Polymer so we need to move up an extra folder to get to @webcomponents (Also, add @webcomponents to the webcomponentsjs path.) (Polymer/polymer-modulizer#174)
• Removed the extra file from the previous work around in HTML Imports for loading a JS file. Swapped to using the import inline. (Polymer/polymer-modulizer#182)
• Removed 'use strict'; since this is always enabled in modules now. (Polymer/polymer-modulizer#181)
• Added the missing marked dependency from conversion. (Polymer/polymer-modulizer#174)
• Added the paper-styles dev depenency for demo. (Polymer/polymer-modulizer#176)
• Added node_modules to .gitignore (Polymer/polymer-modulizer#183)
• Added *.lock to .gitignore (Polymer/polymer-modulizer#183)
• Update Tests to use "legacy" wct-legacy-browser and all references (Thanks @usergenic)
• Tests aren't working with polymer test --npm (@usergenic any thoughts? Polymer/polymer-cli#858)
• Update .travis.yml to run polymer test --npm and install using yarn

Other things to note:

• iron-component-page isn't working (No 3.0-preview branch, Polymer/polymer-modulizer#180)

@rictic @e111077 PTAL

[stramel]

@jorgecasar I believe the consensus is to make these changes upstream instead of manually since they plan to apply these changes in bulk with a new run of polymer-modulizer once these issues are addressed.

Adding a couple of issue references missed here:

Update .travis.yml to run polymer test --npm and install using yarn

Related Issue: https://github.com/Polymer/polymer-modulizer/issues/186

Update Tests to use "legacy" wct-legacy-browser and all references

Related Issue: https://github.com/Polymer/polymer-modulizer/issues/93

[jorgecasar]

Nice, it will be a better solution for sure. I will wait then.