CONTRIBUTING: Parts of repo
index.html: links to open legacy and Helios IDEs
Integrating externals into index.html and Gruntfile

amber-cli now does not need its own bower_components, index.html etc.
http://localhost:4000/internal/ now allows to develop Amber and CLI
with one IDE session.
Merge pull request #1020 from herby/contributing-subprojects

Parts of repo in contributing file, integrating external into dev index.html
Merge pull request #1022 from herby/integrating-externals-development

Integrating externals into index.html and Gruntfile