Bring LICENSE file into the repo.

Bring the license file into the root of the repo to make sure that it's
well know this whole project is apache 2.0

Also added the apache-rat plugin to make sure we stay good.  And I
cleaned up all failures.

Fixes issue #14
Merge pull request #15 from elliottneilclark/LICENSE

Bring LICENSE file into the repo.
Make the thrift converter more zipkin compatibile

Better timestamps
Better formatting of source
Made install not need gpg
Made tests run faster
Made the converter smarter about the ports.
Merge pull request #16 from elliottneilclark/thrift_tweaks

Make the thrift converter more zipkin compatibile
[maven-release-plugin] prepare release htrace-2.03
[maven-release-plugin] prepare for next development iteration