rest sessions: break model looping when image is found
rest: remove unused load_balance route
rest /v3/ltsp_servers: add 'all' option
rest config.ru: fix require calls
rest: put error method to PuavoRest module
rest sessions: fallback to what ever image is available
if the one requested was not available on any ltsp server
remove Gemfile from resremove Gemfile from restt