import 'zone.js' which may cause duplicate , zone already exist error …

[richie50]

…fixed and code updates to reflect angular 6.0.3 (current release)

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/HackedByChinese/ng2-idle/blob/master/CONTRIBUTING.md#pr
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)

What is the new behavior?

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[ ] No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[coveralls]

Coverage increased (+0.007%) to 99.376% when pulling b4c1bc6 on richie50:dev-richie-ng2-idle into 511ee8b on HackedByChinese:master.

[nallarv]

Looks good. When does this PR get merged?

[moribvndvs]

The most important change is removing the extraneous zone.js import. I'm not sure about your changes for RXJS imports. They don't match the docs from Angular or RXJS. I did go ahead with another change to remove the need for rxjs-compat.