feat(ng-repeat): initial implementaion of ng-repeat.

- adds support for content bindings via '[]'.
- directives module
chore: chrome louncher WTF flags
perf: improve baseline speed by 30%

Use node.firstChild and node.nextSibling instead 
of node.children or node.childNodes in the baseline
benchmark.
fix: properly close the <tree> tag in benchmark
chore: update README to make Dart optional
feat(zone): add initial implementation of VmTurnZone
feat(LifeCycle): change LifeCycle to be able register it with a zone
feat(bootstrap): use VmTurnZone and LifeCycle to bootstrap an application
chore(gulpfile): add zone.js to the list of deps
cleanup(zones): cleanup
fix(build): run dartanalyzer after transpiler and html to avoid races
fix(build): disable the analysis of third-party libs
feat(compiler): pass compilation unit to the parser