RemoteTaskActionClient: Better error messages for non-2xx responses.
minor edits based on Vad's feedback
added missing anchor to fix broken internal link
added link to DimensionSpec for alternative way to provide dimensions
provide a little more involved example
expanded and clarified OrderByColumnSpec section
make tests pass with Java 7 as well
Added section on union data sources
fix search with same value in multiple columns
Merge pull request #813 from metamx/better-example-and-test

provide a little more involved example
fix random lowercasing in test
Merge branch 'master' of github.com:metamx/druid into fix-search
Merge pull request #816 from metamx/fix-search

fix search with same value in multiple columns
Merge branch 'master' into fix-datasource-doc
fixed typo and added info that union can take any number of dataSources
added quotes to clarify string value; added example of numeric filter
Clarified sort as optional, object
some minor fixes in docs and change jetty defaults
better default
Merge pull request #821 from metamx/minor-fix

Some minor fixes in docs and change jetty defaults