regenerate book (& update build script pubspec.lock)

staged under https://book-dot-dart-lang.appspot.com/docs/dart-up-and-running/

The old dartdoc page (book-dot-dart-lang.appspot.com/docs/dart-up-and-running/contents/ch04-tools-dartdoc.htm, which is not in the book and thus no longer generated) redirects to the new page. The dart2js situation is handled differently... The page itself just links to the new page. Perhaps I should delete the dart2js page too, even though that'd be different from the book?

R=shaza@google.com

Review URL: https://chromiumcodereview.appspot.com/196023006
Comment out link to non-existent isolates doc

BUG= dartbug.com/17380

Review URL: https://chromiumcodereview.appspot.com/198433002
fixed @host bug

BUG=
R=kathyw@google.com

Review URL: https://chromiumcodereview.appspot.com/197753009
Adding notes about increasing memory usage and Java garbage collection.

BUG=
R=danrubel@google.com

Review URL: https://codereview.appspot.com/75560043