Add installing guide for Google OnHub.

Added installing "xz" if xz not exist. Updated to use curl, because wget is not available on Google OnHub.

Add get_iplayer

Add github_release package

Add apriconv package

Update apr from 1.5.2 to 1.6.2

Update aws from 1.11.110 to 1.11.121

Update llvm to build shared libraries

Update diffutils from 3.5-1 to 3.6

Update automake from 1.15 to 1.15.1

Update subversion from 1.9.5 to 1.9.6

Update ascii from 3.15 to 3.16

Update bind from 9.10.4 to 9.10.5-p3

Update dos2unix from 7.3.4 to 7.3.5

Update cmake from 3.7.2 to 3.9.0

Update di from 4.43 to 4.44

Update cpustat from 0.02.01 to 0.02.03

Update dbus from 1.11.12 to 1.11.14

Add SDL2 (libsdl2) and fix libtheora

Update dropbox from 29.4.20 to 30.4.22

Update erlang from 19.2 to 20.0

Update mongodb to 3.2.15.  Add method to compile it from source.

Adding luajit package

Add nix dependencies

Update expat 2.2.0 to 2.2.2

Update fish from 2.5.0 to 2.6.0

Update fontconfig from 2.11.94 to 2.12.4

Update freetype from 2.7.1 to 2.8

Update gc from 7.2g to 7.6.0

Update proj4 from 4.9.1 to 4.9.3

Update geos from 3.4.2 to 3.6.1

Update gdal from 1.11.2 to 1.11.5

Update geoip from 1.6.9 to 1.6.11

Update git from 2.13.0 to 2.13.3