Get ember-cli-content-security-policy working

[jkleinsc]

I have temporarily removed ember-cli-content-security-policy from package.json because in development it is throwing errors that are confusing new developers. We need someone to correctly configure the app for ember-cli-content-security-policy so that we don't get these errors.

[pete-the-pete]

@tangollama I can take this on. I already created a pr (I'll stick to the steps in the contributing file next time).

I basically just added the package and got rid of errors while working locally.

Are there specific urls I should add for plugins or any other specifics when in a production environment?

[jkleinsc]

It looks like in ember-cli, they intentionally removed this package because of issues: ember-cli/ember-cli#5247, but if the PR @pete-the-pete has provided resolves the warnings, I think its find to add it back in.

[jkleinsc]

Fixed by #335