Issue argoproj#187 - implement `argo settings install` command (argop…

…roj#193)

Revert change to redact credentials since logic is reused by controller

Fix compilation error

Bump version to v0.3.1

Enable auth by default. Decrease app resync period from 10m to 3m

Maintain list of recent deployments in app CRD (argoproj#59)

Add more details to CONTRIBUTING.md. Describe how to run argo-cd locally