Revise the SSL support implementation details

- Remove the complexity around the NoSSL parameter -- the harness can proxy SSL without a problem
- Change naming convention to Ssl from SSL.  e.g. HttpSSLKey is inconsistent with itself.
- Skip adding no-op SSL parameters to sample apps (minus booking)

Conflicts:
	harness/app.go
	harness/harness.go
	revel.go
	server.go