Remove pom.xml cruft; Partially resolves #111.

[ruebot]

GitHub issue(s): #111

What does this Pull Request do?

• Removes unnecessary repositories in pom.xml;
• Removes openwayback-core which should have been removed in the warcbase to aut move (sorry, I missed that one!);
• and cleans up formatting.

How should this be tested?

I've tested it locally by rm -f ~/.m2/repository/* && mvn clean install, and it build fine. It also passes on TravisCI so this should partially address the issue, and be fully resolved by cutting another release. @dportabella let me know if this looks good to you, and we'll proceed. Thanks for letting us know about the issue btw 😃

Interested parties

@dportabella, @lintool

[codecov]

Codecov Report

Merging #112 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #112   +/-   ##
======================================
  Coverage    65.6%   65.6%           
======================================
  Files          36      36           
  Lines         721     721           
  Branches      140     140           
======================================
  Hits          473     473           
  Misses        199     199           
  Partials       49      49

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[lintool]

lgtm