Document dependency on XZ
Merge pull request #8 from abliss/docpr

Document dependency on XZ
Web site updates.
Add extended documentation about setting up the shell, inculding port forwarding issues and an example nginx config.  Fixes #2.  Fixes #7.
tweak
Comment on mongoDB size issues.
Bold, not italic.
More clarifications.
Implement ability to send invite e-mails from web interface.
Make e-mail invites more robust.
Improve keepalive handling, which has been producing lots of errors of late.
Split shell code into several files.
Add checks.
Fix build broken by Cap'n Proto changes.
Implement PUT and DELETE requests, and fix a bunch of bugs.
Update ssjekyll link in app list.
Update to Meteor 0.8.0.
Add a CLA to the web site.  I hate this legal crap but it seems necessary to avoid getting stuck with AGPL forever.
Update shell to use meteor/npm packages for capnp and es6-promise