system_infos: set osname to uname -s, when no lsb_release

This makes it work on Windows. Running in Cygwin on Windows 7 should
give us CYGWIN_NT-6.1 as osname.
Add a success key to each report

This avoids checking the success status of each tbbfile to see if the
report had any error.
Add an option to email test reports
receive_report: send an email when the report has has an email-to option
linus-nightly, linus-nightly-virustotal: send email to me

And later to more people after checking that it works
install-deps: add Email::Simple and Email::Sender
Don't create thumbnails on Windows

For some reason that I did not understand yet, Image::Magick does
not work on Windows, so we're not creating thumbnails if we're
on Windows. In that case, the thumbnails should be created by the
server that receives the results (this is not done yet, but should be
done later).
Add a winpath function

A function to convert a unix path to a windows path, when we are running
on Windows (on other OSes it returns the same thing).

It is done using the cygpath command.
Disable xvfb on Windows by default

Because it doesn't work on Windows.
start_tor: convert paths to windows paths
Set HashedControlPassword in torrc-defaults instead of command line

For some reason, tor on Windows does not like the hashed password that
we give on command line:
  [warn] Failed to parse/validate config: Bad HashedControlSessionPassword:
         wrong length or bad encoding

So instead, we add it to the torrc-defaults configuration file.
Make mozmill_run work on windows

Using mozmill-env downloaded from http://mozqa.com/mozmill-env/ and
installed in c:\tbbtestsuite\mozmill-env.

I initially wanted to use mozmill installed with pip in a virtualenv,
but this does not currently work because of the mix of Windows and
Unix pathes.
Rename $_OUTDIR to torbrowser

It seems a directory called $_OUTDIR can cause some problems on Windows
when used in a command line argument.
Disable selenium tests on Windows for now

Selenium tests are not working yet on Windows, so disable them by
default until this is fixed.