Add contrast

I think this is a great project. This PR has some significant changes, but hopefully keeps the spirit intact.  Consider it the start of a discussion, not something to be merged in as-is.

# Language Changes
I've put all of the points in the format `We value X over Y`  I think "we" is better than "I", because this is about community, not personal virtue.  

Values mean nothing without tradeoffs.  This manifesto outlines things we value - but it should outline our *most important* values as a programming community.  So we include the right-hand things, which are also good things, but less valuable.  When forced to choose between them, we should favor the left-hand things.  

These are not absolutes.  Sometimes you need to make the opposite tradeoff.  But what makes the "happiness-driven" community different is that we will favor the left-hand values whenever possible.

# Implications
Language aside, I've made some substantive changes to the manifesto.  For example, I think the community should favor open-source over corporate solutions - yes, this includes Apple's App Store.  Not that iOS development is unwelcome - tradeoffs and all that - but where possible, we should push for openness.