Costumes and Sound tab strings.

In case the remote one gets deleted for some reason. I already had a fork of gh-pages, which is why I'm using rschamp rather than LLK. This is intended to be temporary.

Currently using an unmerged PR in gh-pages. (Will update to an LLK fork if we decide to go this way.)

Move to Travis build stages to handle the multiple deploy methods by branch.

Stop "testing" in more Node versions than 6, as this is basically just testing our build tools (using a single Node version simplifies using build stages.)

Also add a `watch` command for testing static build output.

Reverts #335.

Pinning to `^0.1.0.prerelease.0` is not equivalent to `latest`, since has the effect of not installing the latest version on `npm install`, you have to also do `npm update`. This hurts us ergonomically on `npm install`, and doesn't help us since we already are releasing breaking changes on `prerelease`.

Closes #345

Closes #344

Closes #352

Closes #346

https://greenkeeper.io/

https://greenkeeper.io/

Pin these modules to 0.*-prerelease.* to avoid problems when we
eventually bump to 1.x

https://greenkeeper.io/

With jscodeshift thank God

https://greenkeeper.io/

# Conflicts:
#	package.json

https://greenkeeper.io/

# Conflicts:
#	package.json

https://greenkeeper.io/

# Conflicts:
#	package.json

Closes #311

https://greenkeeper.io/

https://greenkeeper.io/

https://greenkeeper.io/

Closes #288

https://greenkeeper.io/

These dependencies are only needed by `npm run clean` and (indirectly)
`npm run build` which only work when the other dev dependencies are
installed.

Use `rimraf` and `mkdirp` instead of `rm -rf` and `mkdir -p`.