Provide instructions in application.yml that are consistent with readme

[anselmbradford]

After running script/bootstrap and going to config/application.yml, the file contains the following:

# Add application configuration variables here, as shown below.
#
# PUSHER_APP_ID: "..."
# PUSHER_KEY: ...
# PUSHER_SECRET: ...
# STRIPE_API_KEY: ...
# STRIPE_PUBLIC_KEY: ...

Which appears to indication that the shown environmental variables are used in the project. Instead, perhaps provide language like what is shown in the readme. Something like:

# Set the ADMIN_APP_TOKEN environment variable so that the tests can pass,  
# and so you can run the Ohana API Admin app locally.
#
# ADMIN_APP_TOKEN: your_token

[monfresh]

application.yml is generated by the figaro gem, and can be used for any environment variable you want to store, not just the default ones used by Ohana. The instructions in application.yml should be kept generic. I'll add a link to figaro in the README and explain what application.yml is for.

[monfresh]

We are no longer automatically generating application.yml via the figaro gem. We now have application.example.yml which is better-documented and explained in the installation instructions.