New Dart prose, update Dart and Ts code
+ guide/server-communication/ts: update to docs and example code
+ guide/server-communication/dart: new prose, update example code
+ ignore all npm-debug.logs
+ make Jade ul li TOC elements more compact.
closes#850
'until you've observables a chance' -> 'until you give observables a chance'
'method adds the the search box value' -> 'method adds the search box value'
Ward piggy backed the other updates.
