Expand syntax validation for other examples
Fix docker-links-style env vars for services

This includes 3 changes:

1) Use the Service.Protocol field, rather than hardcoding TCP.
2) Use Service.Port rather than ContainerPort - ContainerPort can be a string
   and has absolutely no meaning to consumers.
3) Beef up tests for these env vars.
Generalize the fit scheduler.
Extract the "fit predicate" from random fit to make it extensible/plugable
Merge pull request #1431 from thockin/svcenv

Fix docker-links-style env vars for services
Merge pull request #1383 from smarterclayton/expand_syntax_validation

Expand syntax validation for other examples
disable travis at tip
Merge pull request #1434 from lavalamp/travis

disable travis at tip
Merge pull request #1421 from brendandburns/resource

Generalize the fit scheduler.
Initial cut of a spreading scheduler.
Add a generic scheduler.
Refactor the code to make it more readable.