feat(testing): add support for jest testing platform

[tinesoft]

First support for jest testing platform. Everything works pretty well(integration in generator's prompt, in library and demo app, gulpfile.js, etc)

One issue remains though: lib.component.spec.ts failed because of By.css i presume.

Help is wanted!

[coveralls]

Coverage decreased (-1.09%) to 90.927% when pulling 73e34ec on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-1.09%) to 90.927% when pulling 73e34ec on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-1.09%) to 90.927% when pulling 4383b01 on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-0.8%) to 91.182% when pulling a8b9a7e on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-0.8%) to 91.182% when pulling a8b9a7e on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-0.03%) to 91.984% when pulling e0b73d5 on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-0.03%) to 91.984% when pulling e0b73d5 on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-0.03%) to 91.984% when pulling 2ef8d99 on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-0.03%) to 91.984% when pulling 2ef8d99 on feat-jest into ff84c6f on master.

[sayuthisobri]

Got error during run gulp build when using minimal version 2.X.X.
Working fine on version 5.X.X

[tinesoft]

Hi,

Yes, i noticed this error on ng2 builds too, from another branch i built based on this one (#137 chore-jest).
I think it's a dependency issue. I will have a closer look tonight

[coveralls]

Coverage decreased (-0.03%) to 91.984% when pulling 93f4514 on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-0.03%) to 91.984% when pulling 93f4514 on feat-jest into ff84c6f on master.

[coveralls]

Coverage decreased (-0.03%) to 91.984% when pulling ccc905b on feat-jest into ff84c6f on master.