add packages resolution to the web server
merge to master
add analyzer service tests; upgrade dart2js dep; upgrade the built-in sdk
turn off analyzer tests when compiled to js
fix misc tests
cleanup coding style
Merge pull request #1315 from sunglim/clean

cleanup coding style
Added Nexus 4
Merge pull request #1317 from dinhviethoa/nexus-4

Added Nexus 4
Update spark.dart
nits
Merge pull request #1289 from devoncarew/devoncarew_launch_packages

Devoncarew launch packages
Merge pull request #1314 from devoncarew/devoncarew_add_analyzer_tests

Devoncarew add analyzer tests