Merge pull request #16 from eagafonov/master

Fix 'screen' package creation
Add sudo to apt-get install command.
Add pwnat - tool fot NAT traversal.
Fix wget error about gettext infrastructure mismatch.
Update which to current from buildroot master.
Add tinc - VPN's software.
Add miredo, Teredo IPv6 tunneling software.
Add fw_env.config for uboot utils (read/write enviroment).
Fix fw_env.config for correct params. Now fw_setenv working well.