Update Travis CI configuration in .travis.yml

[SaiedKazemi]

This commit makes two changes:

1. It removes "docker build ." because Travis builds are failing due to Docker Hub rate limits and we don't need the continer image that Travis builds anyway.

2. It moves uploading of coverage information to the "after_success" stage so that a failure in uploading coverage doesn't cause Travis to fail.

Tested via a push to my feature branch, triggering a build. Both Docker Hub and Travis CI passed.

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This change is 

[coveralls]

Pull Request Test Coverage Report for Build 103

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.626%

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Totals
Change from base Build 94:	0.0%
Covered Lines:	1069
Relevant Lines:	1095

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💛 - Coveralls

[gfr10598]

Yes - dockerhub builds the docker container, and our k8s deployment k8s-support gets it from dockerhub (we think).