Remove maven central repository, use only jcenter

[yinonavraham]

jcenter is a super set on top of maven central, so having both of those repositories is redundant, and the preferred one should be jcenter.

[ijuma]

Thanks for the PR. Why should jcenter be the preferred one?

[yinonavraham]

• jcenter delivers library through CDN which means improvements in CI and developer builds.
• jcenter is the largest Java Repository on earth, so whatever is available on Maven Central is available on jcenter as well.

See: https://www.jfrog.com/knowledge-base/why-should-i-use-jcenter-over-maven-central/

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