Remove spec, whitepapers, request_codereview, issue_exporter from trunk.

Follows on from discussion on list, and review:
https://reviews.apache.org/r/11609/


git-svn-id: https://svn.apache.org/repos/asf/incubator/wave/trunk@1489320 13f79535-47bb-0310-9956-ffa450edef68
Improve default logging configuration, through external file.

Review: https://reviews.apache.org/r/11597. By Dave Ball.


git-svn-id: https://svn.apache.org/repos/asf/incubator/wave/trunk@1489321 13f79535-47bb-0310-9956-ffa450edef68
Remove some replicated(empty) third_party/runtime/third_party dirs


git-svn-id: https://svn.apache.org/repos/asf/incubator/wave/trunk@1489364 13f79535-47bb-0310-9956-ffa450edef68
Add missing backslash following 11957.


git-svn-id: https://svn.apache.org/repos/asf/incubator/wave/trunk@1489803 13f79535-47bb-0310-9956-ffa450edef68