Request: Support environments other than release and debug

[drice]

Currently, there are two supported environments, release and debug. The default is debug and "--release" can be used to build a release version of the app. It would be useful to have other environments, so I was wondering if it would be possible to add an "--environment" flag be allowed to specify these.

For example, "tns run android --environment=test" would use the file app.component.test.ts.

[vallemar]

I think this should close, the cli now supports --env.env stage or --env.env prod or --env.env xxxx