Mingw32 package for GnuPG

An installed GnuPG will be picked up by mgwport and allows to check the signature
of a downloaded archive during package building.

For example after installing GnuPG:
------------------------
$ mgwport gnupg-1.4.13-1.mgwport prep
>>> Preparing gnupg-1.4.13-1
*** Info: SOURCE 1 signature follows:
gpg: Signature made 12/20/12 20:48:35 using RSA key ID 4F25E3B6
gpg: Good signature from "Werner Koch (dist sig)"
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: D869 2123 C406 5DEA 5E0F  3AB5 249B 39D2 4F25 E3B6
>>> Unpacking source gnupg-1.4.13.tar.bz2
>>> Preparing working source directory
------------------------

The version of GnuPG is rather old, because newer versions are split into very many
different libraries, so the hassle to build them is much bigger.

Signed-off-by: Thomas Braun <thomas.braun@virtuell-zuhause.de>
readme: Add a "Getting involved" section; several other wording improvements

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Signed-off-by: Thomas Braun <thomas.braun@virtuell-zuhause.de>
readme: Improve the formatting a little bit
Merge pull request #7 from t-b/mingw32-gnupg-v2

Mingw32 package for GnuPG
mingw32-gnupg: Fix some formatting issues

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
mingw32-gnupg: Add the missing dependency to libiconv

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
mingw32-gnupg: Add a patch to use the correct iconv DLL name

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
mingw32-gnupg: Add the missing dependency to libz

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
installer: Add mingw32-gnupg as a recommended package

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>