minor fixes
started applying new layout
added empty articles to commands/how-to
added client-api/session
added client-api/changes-api
added client-api/listeners
added client-api/session/configuration
added client-api/bundles
added client-api/bulk-insert
added client-api/faq
added client-api/how-to
normalizing headers
started documenting client-api/commands/what-are-commands
Merge branch 'master' of https://github.com/ravendb/docs into 3.0