* chore(demos): WIP refactor gulp demos task to use SystemJS
move build files into dist/demos and comment out the AoT demos task for
right now. This makes both `gulp demos` and `gulp demos.watch`work
again.
references #8411
* docs(demos): fix infinite scroll demo
* chore(demos): move old demos task to demos.prod
update the demos file with shared tasks, include the shared css
* docs(demos): fix API demos to use correct styles
* chore(demos): remove the main.ts files from each demo
* chore(demos): add prod template and constant
* chore(demos): remove tsconfig and package from demos
* chore(demos): update app.module path to ionic
* chore(demos): update app.module path to ionic
* chore(demos): update prod task for demos to work with AoT
also puts the demo build files into dist/ instead of the src directory
* docs(demos): update deploy and docs tasks for new build
* docs(scripts): update demos README
* chore(demos): fix path for prod build
