make it clear: you can only download those pexes because you previously uploaded 'em.

they don't appear by magic.

Reviewed at https://rbcommons.com/s/twitter/r/1296/
Ensure that the new options system reports goals in the right order.

We sometimes rely on this, e.g., when specifying "clean-all compile".

Testing Done:
option unittests pass. CI passed when run with https://rbcommons.com/s/twitter/r/1309/

Reviewed at https://rbcommons.com/s/twitter/r/1308/
Switch option parsing for goals to the new parser.

Relies on https://rbcommons.com/s/twitter/r/1308/.

Testing Done:
CI passed when run with https://rbcommons.com/s/twitter/r/1308/.

Reviewed at https://rbcommons.com/s/twitter/r/1309/
Add support for the Wire protobuf library.  Adds the java_wire_library() target.

https://github.com/square/wire

Testing Done:
Added an example, plus new unit and integration tests.
CI is running @ https://travis-ci.org/pantsbuild/pants/jobs/39988400

Bugs closed: 765

Reviewed at https://rbcommons.com/s/twitter/r/1275/
Remove some remaining old options references.

Testing Done:
CI passed. Manual testing of cmd-line flags.

Reviewed at https://rbcommons.com/s/twitter/r/1317/
docs: confluence-publish's wiki info lives in a plugin now.

also, give a sample ConfluencePublish goal.

Bugs closed: 723

Reviewed at https://rbcommons.com/s/twitter/r/1299/
doc: update import path for PEX

"I don't see any code still importing twitter.common.python pex (except for examples in rst files,which should probably be fixed)"

Bugs closed: 428

Reviewed at https://rbcommons.com/s/twitter/r/1298/