rework deployment configuration (using less of the express mechanism) so that configuration options are available at all levels

break out substitution framework from top level run harness.  this will be used to perform hostname substitution in dev and prod environments.

update package.json with new dependencies.  update getting started instructions with how to use npm to install deps.  ref package.json from the README rather than duplicating information.  closes #60 (equivalent).

(test server) fix content-length: the number of bytes, not the number of chars (fun with node.js buffers!).

close #100

Conflicts:
	browserid/views/developers.ejs

verifier now accepts parameters over POST in addition to GET, use of the former is preferred and user identifiable data out of http logs.  closes #96

Very useful for usability.

issue #92

Adding labels, using more semantic markup.

issue #92

basic testing of all db.js apis complete, also completed implementation of identitysync to check installed pubkeys.

Can select buttons using the email address.
Can move through the email addresses and buttons using the tab/arrow keys.

close #86