Copy coveralls config in travis env

This fixes #174 by restoring the coveralls config to the travis.yml
file.
Only report to coveralls if in CI env
# This is a combination of 9 commits.
# The first commit's message is:
Changing secrets.yml

# This is the 2nd commit message:

Added helper to test secrets injection

# This is the 3rd commit message:

Added fields to test as well as dev

# This is the 4th commit message:

Changed the secrets.yml to reflect new direction

# This is the 5th commit message:

use application helper instead of ENV

# This is the 6th commit message:

Remove secret_token.rb

# This is the 7th commit message:

Fixed an issue with active_admin

# This is the 8th commit message:

Fixed an issue with the search index

# This is the 9th commit message:

Strings are strings, flatten them out
Merge pull request #225 from 18F/feature/change_secrets_variables

Replaced dotenv and .env with secrets.yml
Merge pull request #221 from 18F/fix/add_coveralls_config_to_travis

Copy coveralls config in travis env