This ensures that the reducer is actually called with the project data that storage loaded

Remove the default prop test because the default projectId prop comes from redux now, so it doesn't make sense to test the default

Lint

I think this switches all the icons we saw. I also switched the icons on the tabs (the blocks going the wrong way looked bad).

Expected change for a className that uses classNames function now, but didn’t before.

Locale detection function that checks browser setting and lets URL parameter (locale= or lang=) override the browser setting.

Add `?locale=<localecode>` to load in a new langage.
Add `?enable=language` to enable the language selector
Or combine the two: `?enable=language&locale=<localecode>`
Still accepts a hash, but requires that the hash be a sequence of digits.

Added new locales reducer to gui:
- initializes default  react-intl/localeData
- initializes default locale messages for all locales
- default locale is ‘en’ (can be overridden by URL)

Removed dependency on react-intl-redux, added ConnectedIntlProvider (uses correct locale messages from redux based on current locale)

* Export initial states for each reducer
* combine all gui reducers (excludes scratchPaint and intl)
* combine all initial states to create default guiState for preloading in www
* expect all of the gui state to be accessible at `state.scratchGui`

- better split of hash-parser/project-loader unit tests.

The project loader that is exported with GUI just expects to be passed projectId as a prop, and it manages loading project data.

The part of the project loader that watches for URL hash changes for the playground is a new HOC that is only used in the various playground examples.

Question, should ‘x’ and ‘y’ be localizable?

- export image and sounds in dist/static/assets
- rename main export (`scratch-gui.js`, not `index.js`)
- move project-loader-hoc back to lib (VM doesn’t load properly without it)

Allow intl to be passed in to GUI as a prop (rather than having to be already in the store)

Add a jest unit test for making sure the number is rendered out when
provided and not when not provided.