Added --crosscert and --timestamp options to buildtap.py

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>
Updated README.rst

- Switched to 80 character lines
- Updated usage information
- Added a section about proxies and timestamping

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>
Fixed minor formatting error in README.rst

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>
Merge remote-tracking branch 'upstream/master'
Merge pull request #2 from mattock/master

Updates to the tap-windows6 build system and documentation