add test for core-localstorage-dart
#41
use double quotes consistently
#41
add tests for core-selection and core-test

core-selection (ok)
core-selection-multi (ok)
core-selector-activate-event (fails see #51)
core-selector-basic (fails see #52)
core-selector-multi (fails see #52)

related to #41
#41 add ported test for core-shared-lib
add todo for skipped test
Merge branch 'master' of github.com:dart-lang/core-elements into core-selection-test
add reference to issue #51
add workaround for missing fields in Dart
add reference to issue #51
Merge pull request #53 from zoechi/core-selection-test

core-localstorage, core-selector, and core-selection tests