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Also make updates to style scoping based on feedback from @rschamp

Adds:
1. Make it Fly
2. Make Music

Removes:
1. Hide-and-Seek
2. Dance, Dance, Dance

Fix gh-918: Update Video Link

As per @sleggss on #918

Don't set state to undefined API response bodies

Adding routes to microworlds

Use html-webpack-plugin for html rendering

Remove interactions with session cookie

Move the rest of the configuration into template-config.js.  This way the options are explicitly in the same namespace so we won't be surprised when we add a variable with the same name as an html-webpack-plugin option.

Rename template extension to ejs for syntax-coloring purposes.

Add Cache-Control header to all S3 uploads

This resolves the "Cannot read property 'x' of undefined" errors that occur when the API returns non-JSON responses. For instance if the proxy endpoints return 500 error responses from scratchr2.

Instead of retrieving the permission from the session cookie, store permission data from /session/, and cache it in a cookie.  On subsequent page loads, the permission information will be retrieved from the cookie more quickly than the /session/ endpoint returns. When the session changes, the cookie and permissions state is updated to reflect the new state.

We're not using it yet, and it won't be coming from the cookie when we do.

This plugin will likely be updated when webpack is updated.

- Change art microworld text to not refer to videos.

Rename Albanian correctly

My bad on the misunderstanding!

Fix gh-894: Community Guidelines Image

Fix gh-900 // Update Credits

Fix GH-872: Check for username before sending

thanks @rschamp!

the `//` for an empty username that gets sent to the backend causes a 500 error. This is an edge case in formsy, as it has not detected a change value yet, so handle it in the username validation method. Fixes #872

Just realized I took the whole footer off, not just the image.

Update to hide page's footer image when the screen is too small.

Bugfix: Add webkit prefixes for safari 8

`caniuse` updated their api recently, and it appears that support for safari 8 is no longer in the last 3 versions (and it appears that safari 8 is not listed as supported there in general). explicitly add the version back in to make sure the proper `-webkit` prefixes are included for that browser.

Fix GH-825: Only require zip code for US addresses

Fix gh-844 // Update Readme

Fix gh-864 // Update Conference Text

Since we only check for the US, only require for that country. Other countries have zip codes, but it seems better to do it this way than codify which countries do/do not have zip codes (in case local practices are not the same as international information). Fixes #825