Add support for Traefik as ingress controller

[Miouge1]

This adds support for Traefik as an Ingress controller

To use it simply comment the nginx annotations and uncomment the traefik annotations.

Tested with Traefik 1.3.3

[prydonius]

Thanks @Miouge1! Do you want this to be released as a new chart version? I'm not sure it makes sense since this is just updating documentation, but if you feel it should then bump the version in Chart.yaml.

[codecov-io]

Codecov Report

Merging #329 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #329   +/-   ##
=======================================
  Coverage   88.99%   88.99%           
=======================================
  Files          15       15           
  Lines         618      618           
=======================================
  Hits          550      550           
  Misses         45       45           
  Partials       23       23

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[Miouge1]

Agreed, I don't think a new version number is necessary either

[prydonius]

Ok, in that case I'll merge as-is. Thanks again!