Merge branch 'performance'

Update comparison benchmark and performance testing snippets to current API.
Import Builder qualified
Update README with current API
Use Builder for parameters in postForm
Update io-streams dependency to 1.0
Preliminary implementation of openConnectionSSL
Add missing export for openConnectionSSL
Make SSLContext a parameter of openConnectionSSL
Document openConnectionSSL and baselineContextSSL
Add snippet testing SSL connections
Merge branch 'ssl-connections'
Simplify documentation

Remove unnecessary imports from initial SSL code example.

Add errors to baselineContextSSL to note Windows and Mac OS X are not
yet configured.