Enable mcrypt, intl and exif support in PHP
php: Add xsl optional support

Use an override with xsl = true to enable xsl support in php.
php: Add mcrypt optional support

Use an override with mcrypt = true to enable libmcrypt support in php.
The --disable-posix-threadsds mcrypt build option was required by php.
php: Add zip and optional bz2 support

Use the overload bz2 = true to enable bz2 support for php.
zip support is enabled by default as it doesn't require any library.
compile fix: <stddef.h> needed for size_t
openocd: bump from 0.4.0 to 0.6.1

Also:
 * Remove commented out "GuruPlug installer" stuff that hasn't worked
   since openocd 0.2.0 (according to the comments).
 * Build with support for the following JTAG hardware:
   - Segger J-Link
   - Raisonance RLink
   - Keil ULINK
   - STMicroelectronics ST-Link
python-progressbar: fix license attribute
Linux 3.0.65
Linux 3.4.32
Linux 3.7.9
pynzb: fix license attribute
wicd: NixOS/nixos#88 add resolvconf to PATH for wicd

with this patch resolvconf is used to set the DNS via wicd, although
this doesn't seem to stop dhcpcd from clobbering /etc/resolv.conf
Adding snappy 1.1.0
Add aespipe, an AES encrypting or decrypting pipe
notmuch: update from 0.14 to 0.15
alot: update to last working revision
turses: update to 0.2.12 and its dependency tweepy to 2.0
Fixing openssh hpn support for 6.1p1

I had to write a weird download derivation to overcome their download procedure.
openssh: Just use a mirror of the HPN patch
Fix evaluation