Add make_tools.py to generate adb.zip and fastboot.zip.

[maruel]

Change imports to always be relative to the package, e.g. "from adb import ..."

make_tools.py creates standalone, easy to distribute executables meant to be
used in a continuous integration system via various CPU architecture where
having interpreted code is valuable.

Make progressbar optional so both adb.zip and fastboot.zip do not have any hard
dependency except python-libusb.

[fahhem]

transferred to other*

[fahhem]

There are merge conflicts, but otherwise LGTM

[maruel]

Rebased. Thanks for the README.rst -> README.md rename. I should have left out of this PR but doing it upfront is even better.

[fahhem]

Hmm, we should include the output of make_tools.py into the releases, I wonder if there's a way to do that automatically?

[maruel]

You mean on github? Good question. I have never done that but I doesn't look too hard; https://developer.github.com/v3/repos/releases/#create-a-release

[fahhem]

Ah, I see, you upload arbitrary binary files for the release. Maybe there's tooling, or I'll have to remember to run make_tools.py before each release?

[maruel]

You could use it when you create tags, https://docs.travis-ci.com/user/deployment/releases/

[fahhem]

Ah, there we go! Thanks! A travis config to run make_tools.py in before_deploy and then upload the files on tag creation will be the plan then, I'll make an issue now