ubnt.com's AirCam support

```
I was trying to rebuild ubnt's AirCamMini firmware (just wanted to add openvpn).

firmware-mod-kit was pretty able to extract filesystem from firmware image;
however, no success in rebuilding it back.

Binwalk found

DECIMAL HEX DESCRIPTION
--------------------------------------------------------------------------------
-----------------------
852872 0xD0388 Squashfs filesystem, little endian, version 4.0,
compression: gzip, size: 5119965 bytes, 1107 inodes, blocksize: 131072 bytes,
created: Wed Sep 5 12:41:57 2012

crcalc found 0 header(s) (I do not understand the process enough to find out if
it's right), so 'Firmware header not supported; firmware checksums may be
incorrect. '

Sure, firmware loader did not recognize new firmware, and don't want to load it.

Have not tried tftp yet; do not have much hope on it.
```

Original issue reported on code.google.com by `tark...@gmail.com` on 26 May 2013 at 6:33

No source file or test is named. Start by reproducing the AirCamMini extraction and rebuild failure described around the Binwalk-detected SquashFS filesystem and the unsupported firmware header/checksum message. Done means a rebuilt image is accepted by the firmware loader; the issue notes that TFTP was not tried.

Written by the indexing model from the issue text.