CDAP-811: Get rid of custom scripts in examples/apps/packs/guides in favor of CLI

The problem now is that the individual app manager scripts knew which elements needed to be started. Which Flows, Procedures, Services, Workflows, etc. 
If we go with this, the new format for these commands is
``bin\cdap-cli.bat start <program> <app-id.program-id>``

However, how do we now expect users to figure out what they need to start and stop?

In the case of CountRandom, the command would be:
``cdap-cli.bat start flow CountRandom.CountRandom``

For HelloWorld, two commands are needed:
``cdap-cli.bat start flow HelloWorld.WhoFlow ``
``cdap-cli.bat start service HelloWorld.Greeting``

Where should this be documented?