Merge branch 'master' into array-splice-only-start

.github/ISSUE_TEMPLATE.md

@@ -9,8 +9,11 @@ If you are asking a question rather than filing a bug, try one of these instead:
 <!-- Example: Error thrown when calling `appendChild` on Polymer element -->
 
 #### Live Demo
-<!-- Fork this JSBin, or provide your own URL -->
+<!-- jsBin starting point (fork and edit) -->
 https://jsbin.com/luhaxab/1/edit
+<!-- glitch.me starting point (remix and edit -- must be logged in to persist!) -->
+https://glitch.com/edit/#!/polymer-repro?path=my-element.html:2:0
+<!-- ...or provide your own repro URL -->
 
 #### Steps to Reproduce
 <!--

.travis.yml

@@ -1,5 +1,5 @@
 language: node_js
-sudo: false
+sudo: required
 dist: trusty
 node_js: stable
 addons:
@@ -15,9 +15,8 @@ before_script:
 - gulp update-types
 - git diff --exit-code
 script:
-- xvfb-run wct -l chrome
-- xvfb-run wct -l firefox
-- if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then wct -s 'windows 10/microsoftedge@14' -s 'windows 10/microsoftedge@15' -s 'windows 8.1/internet explorer@11' -s 'os x 10.11/safari@9' -s 'macos 10.12/safari@10' -s 'macos 10.12/safari@11' -s 'Linux/chrome@41'; fi
+- wct -l chrome -l firefox
+- if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then travis_wait 30 ./util/travis-sauce-test.sh; fi
 env:
   global:
   - secure: bfF/o1ewpOxDNqTzWfvlwgRgGfP8OXhSQLLdEwZ6izO9tckMJuSNghk3qBXCEQJwTcUEyXP6EqfzIrRAvDXPa0H3OoinbrooDyV2wIDaVRK++WR2iZIqzqo3hGOdzm4tdrGJZe5av5Rk661Hls8aPfLbjdzcGuYXi8B4wZq2xMI=

CONTRIBUTING.md

@@ -42,7 +42,7 @@ If you find an issue, please do file it on the repository. The [Polymer/polymer
 
 For issues with elements the team maintains, please file directly on the element's repository. If you're not sure if a bug stems from the element or the library, air toward filing it on the element and we'll move the issue if necessary.
 
-Please file issues using the issue template provided, filling out as many fields as possible. We love examples for addressing issues - issues with a Plunkr, jsFiddle, or jsBin will be much easier for us to work on quickly. You can start with [this jsbin](http://jsbin.com/luhaxab/edit) which sets up the basics to demonstrate a Polymer element.
+Please file issues using the issue template provided, filling out as many fields as possible. We love examples for addressing issues - issues with a jsBin, Plunkr, jsFiddle, or glitch.me repro will be much easier for us to work on quickly. You can start with [this jsbin](http://jsbin.com/luhaxab/edit) which sets up the basics to demonstrate a Polymer element.  If you need your repro to run in IE11, you can start from [this glitch](https://glitch.com/edit/#!/polymer-repro?path=my-element.html:2:0), which serves the source via polyserve for automatic transpilation, although you must sign up for a glitch.me account to ensure your code persists for more than 5 days (note the glitch.me _editing environment_ is not compatible with IE11, however the "live" view link of the running code should work).
 
 Occasionally we'll close issues if they appear stale or are too vague - please don't take this personally! Please feel free to re-open issues we've closed if there's something we've missed and they still need to be addressed.
 

lib/elements/dom-repeat.html

@@ -473,7 +473,6 @@
           this.__debounceRender(this.__render, this.delay);
         } else if (this.__observePaths) {
           // Otherwise, re-render if the path changed matches an observed path
-          path = path.substring(path.indexOf('.') + 1);
           let paths = this.__observePaths;
           for (let i=0; i<paths.length; i++) {
             if (path.indexOf(paths[i]) === 0) {