Generate .EXEs to make life easier for Windows admins

[jay0lee]

PyInstaller makes it pretty simple to generate single-file .EXEs (32 and 64 bit) for Windows users. This is much easier than walking them through installing Python, pip-installing dependencies and then running the script.

Basic steps to setup a Windows buld machine would be:

1. On x64 machine, install Python 2.7.11 for both x64 and x32. Our .bat file expects the paths c:\python27 and c:\python27-32 respectively (that can be changed as needed).
2. Run

c:\python27\scripts\pip install google-api-python-client
c:\python27-32\sripts\pip install google-api-python-client

to install the API Client, oauth2client and other necessary libaries.
3. Install 7-zip to handle .zip of .exe and license so it can be added to a release on GitHub. http://www.7-zip.org/download.html
4. Now from the import-mailbox-to-gmail source folder it should be possible to run:
build.bat 1.3

to compile the .EXEs and zip them so that they are ready for release.

Pull requests inbound...

[jay0lee]

Oops, step 2.5 would be to install pyinstaller:

c:\python27-32\scripts\pip.exe install pyinstaller
c:\python27\scripts\pip.exe install pyinstaller

[devvvlanger]

@jay0lee I noticed a typo, just thought I'd let you know.

Btw, your work is phenomenal!

[eesheesh]

Fixed in #65.