Update zone.js to version 0.6.6 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

zone.js just published its new version 0.6.6, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of zone.js – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 47 commits .

• 52073b2 chore: v0.6.6
• d7c116b fix(zone): remove debugger statement
• 0a6a434 feat(zonespec): add a spec for synchronous tests
• f3f8628 Update utils.ts
• faa3485 fix: Canceling already run task should not double decrement task counter
• 9b3e779 chore: v0.6.5
• 84a251f feat(indexdb): Added property patches and event target methods as well as tests for Indexed DB
• 99940c3 fix(utils): add the ability to prevent the default action of onEvent (onclick, onpaste,etc..) by returning false.
• f25b087 fix(WebSocket patch): keep WebSocket constants
• aeeb05c feat(zonespec): add a spec for asynchronous tests
• 4d108ce docs(developer): add developer notes and fix karma local run
• 5e72c01 chore(package.json): use browser field
• 0dba019 fix(zonespec): Do not crash on error if last task had no data
• 1787339 fix(browser/utils): calling removeEventListener twice with the same args should not cause errors
• 4a4d4f6 fix: disable safari 7

There are 47 commits in total. See the full diff.

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