fix #975.

current zone-error provide several functionality.

1. handle class MyError extends Error, new MyError() instanceof Error will report false issue.

2. remove zone.js internal stack trace frames.

3. add zone information to each zone frame.

The No2 and No3. feature will slow down the new Error() performance,
So the motivation of this PR is to provide a flag to let user be able to disable No2 and No3.

The flag is __Zone_Error_BlacklistedStackFrames_policy. And the available options is:

1. default: this is the default one, if you load zone.js/dist/zone-error without
   setting the flag, default will be used, and BlackListStackFrames will be available
   when new Error(), you can get a error.stack which is zone stack free. But this
   will slow down new Error() a little bit.

2. disable: this will disable BlackListZoneStackFrame feature, and if you load
   zone.js/dist/zone-error, you will only get a wrapped Error which can handle
   Error inherit issue.

3. lazy: this is a feature to let you be able to get BlackListZoneStackFrame feature,
   but not impact performance. But as a trade off, you can't get the zone free stack frames by access error.stack. You can only get it by access error.zoneAwareStack.