Fix master build and doc build deployments

[ThomasBurleson]

Travis uses tests and post-test shell scripts to deploy doc updates, master builds, and npm releases:

• master builds to angular/bower-material (using bower-material-release.sh)
• code documentation builds (on HEAD) to angular/code.material.angularjs.org using (snapshot-docs-site.sh)
• Similarly Travis uses travis-build-init.sh to trigger an NPM release processes with release.sh.

All three (3) scripts should use a new github token ANGULARJS_MATERIAL_BUILDS_TOKEN. This token should be defined as a environment variable in Travis https://travis-ci.org/angular/flex-layout/settings.

Note: the current AngularJS Material scripts use GH_TOKEN; which is no longer available as an environment variable.

[ThomasBurleson]

NOTE:

• Bower builds/deploys use the ANGULARJS_MATERIAL_BOWER_TOKEN variable
• Doc Deploys use the ANGULARJS_MATERIAL_DOCS_SITE_TOKEN variable

[ThomasBurleson]

Fixed with SHA aa92290. Use https://material.angularjs.org/HEAD/