Documentation: add notes on patch release branches

connector/ldap: default email_verified to true

*: add section about dex and Kubernetes to README

Documentation: add examples of mapping LDAP schema to a search

storage/kubernetes: remove unused method

Document managing dependencies

*: add Travis build status to README

*: update travis to use Go 1.7.4.

Themes plus css refactor

*: update vendored go-oidc

revert "Merge pull request #714 from amrutac/refactor-css"

This reverts commit 4d88eabb, reversing
changes made to b38d3552.

Includes fixes for a panic when using HTTP/2[0] and some HTTPs calls
not actually using their passed context[1].

[0] https://github.com/coreos/go-oidc/pull/117
[1] https://github.com/coreos/go-oidc/pull/119

Refactor css

cmd/example-app: use a non-empty state

Use a non-empty state in the example-app to ensure dex is properly
preserving the state for the code flow.

Updates #712

*: add theme based frontend configuration

This PR reworks the web layout so static files can be provided and
a "themes" directory to allow a certain degree of control over logos,
styles, etc.

This PR does NOT add general support for frontend customization,
only enough to allow us to start exploring theming internally.
The dex binary also must now be run from the root directory since
templates are no longer "compiled into" the binary.

The docker image has been updated with frontend assets.

Documentation: clarify difference between LDAP ports and security guarentees