Godeps,user: update uuid package reference

The package code.google.com/p/go-uuid/uuid has been moved to
github.com/pborman/uuid. Update the reference.

Closes #224

Documentation: dex roadmap

use cobra for dexctl cli logic

db, functional: make value column in key not pkey

go-oidc increased the size of the generated keys, which were too large
to be used as primary keys in postgres.

closes #220

:* run all functional tests through travis CI

server: better UX when remote ID already exists

Instead of cryptic message with nowhere to, give them the choice to
login with that account or register.

Update k8s README to --template syntax

server: fix flow when user logs in through wrong connector

This cleans up the code that deals with a user attempting to login
through a different connector than they registered with. The only
functional change is that `newLoginURLFromSession` is now called
with register = false when a user has an existing account.

cmd: reduce backoff max when worker is waiting for connectors

fixes #177

.travis.yml: Push to repo after success

*: use coreos postgres image for travis ci

Moved postgres image from personal account to quay.io/coreos.

*: add functional tests to travis config (WIP)

Godeps: update github.com/coreos/go-oidc

connector: document Connector and ConnectorConfig interfaces

don't call go-bindata on every build

Add go generate rule to generate migration assets.

*: add .travis.yml and status badge to README

closes #203

cmd, db: verify at least one secret is passed to --key-secrets

server: fix tests

Passing an empty list to the overlord or worker's --key-secrets
flag currently causes an out of range panic. Always check to ensure
there's at least one element passed.

Fixes #130
Fixes #217

In #210 a field name in the provider config was corrected. However
the old, and incorrect, value was hard coded in the tests. This
change updates the test case to hold the correct field name.

There are no other references to the old name in dex or its
vendored packages.