Add tools directory with scripts for nightly builds.
Use an environment variable for selecting PGP key to sign with.
Invoke prune-old-builds on success.
Bug #9010: Add Turkish to beta and alpha language codes.
Bug #10383: Enable NIST P224 and P256 accel support for 64bit builds.
Bug #11190: Switch linux PT build process to python2.

Fixes arch and other distros that think 'python' should be python3.
Bug 11200: Prevent spurious error message prior to enabling network.
Fix up backport application so that nightlies contain unmerged patches.
Use multiple flashproxy bridge lines.

In https://trac.torproject.org/projects/tor/ticket/10429#comment:2 we
got a bit better reliability with more bridge lines. This doesn't cause
flashproxy-client to send more registration methods, but it does hint to
tor that if a bridge is being slow or unreliable it can try connecting
again to get another.

The corresponding change in the flashproxy repo is
https://gitweb.torproject.org/flashproxy.git/commitdiff/51bdfe59cad37a5f2ffdac3b5f40fe5e2f402a2e.
Use a TORSOCKS make variable.

This allows you to selectively disable torsocks from the command line
using a command like
	make prep TORSOCKS=
Document the TORSOCKS make variable.
Merge remote-tracking branch 'linus/tools'
Merge remote-tracking branch 'tbb/master'