chore(upgrade): to dart r0.7.4.0_r27587
feat(ng_events): directives for many DOM events

Closes #118
chore(directive): use annotations directly.
docs(ng_events): fix indentation and wording

Closes #118
test(ng_show): Use the TestBed in ng_show_spec.
feat(scope): Implement watchCollection for maps
docs(Interpolate): added interpolate docs
fix(interpolate): Fix the build.
fix(templateurl_spec): Make the test work in both Dart versions 0.7.2 and 0.7.3
feat(specs): Added a not.toEqual() expectation
feat(jquery): Added a .css method
feat(directives): ng-style

Closes #135
feat(directives): ng-class, ng-class-odd, ng-class-even

Closes #120