Update Documentation

doc/build-linux

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+Dependencies
+------------
+
+ Library     Purpose           Description
+ -------     -------           -----------
+ libssl      SSL Support       Secure communications
+ libdb4.8    Berkeley DB       Blockchain & wallet storage
+ libboost    Boost             C++ Library
+ miniupnpc   UPnP Support      Optional firewall-jumping support
+ libqrencode QRCode generation Optional QRCode generation
+
+
+Compile Options
+------------
+
+miniupnpc may be used for UPnP port mapping.  
+Set USE_UPNP to a different value to control this:
+ USE_UPNP=-    No UPnP support - miniupnp not required
+ USE_UPNP=0    (the default) UPnP support turned off by default at runtime
+ USE_UPNP=1    UPnP support turned on by default at runtime
+
+libqrencode may be used for QRCode image generation.
+Set USE_QRCODE to control this:
+ USE_QRCODE=0   (the default) No QRCode support - libqrcode not required
+ USE_QRCODE=1   QRCode support enabled
+
+Licenses of statically linked libraries:
+ Berkeley DB   New BSD license with additional requirement that linked
+               software must be free open source
+ Boost         MIT-like license
+ miniupnpc     New (3-clause) BSD license
+
+
+Dependency Build Instructions: Ubuntu & Debian
+----------------------------------------------
+
+First ensure you have build essentials installed:
+sudo apt-get install build-essentials
+
+Install Boost:
+sudo apt-get install libboost-all-dev
+
+Install Berklee DB:
+sudo apt-get install libdb-dev libdb++-dev
+
+Install Open SSL:
+sudo apt-get install libssl-dev
+
+Install Mini UPNP
+sudo apt-get install libminiupnpc-dev
+
+Install QrenCode:
+sudo apt-get install libqrencode-dev
+
+For the Qt, install QT Framework:
+sudo apt-get install qt4-qmake libqt4-dev
+
+Build Instructions (Daemon): Ubuntu & Debian
+----------------------------------------------
+cd ~
+git clone https://github.com/Nexusoft/Nexus.git Nexus
+cd Nexus
+make -f makefile.unix
+
+To Execute:
+./nexus
+
+
+Build Instructions (Qt): Ubuntu & Debian
+----------------------------------------------
+cd ~
+git clone https://github.com/Nexusoft/Nexus.git Nexus
+cd Nexus
+qmake nexus-qt.pro "RELEASE=1" "USE_UPNP=1"
+make
+
+To Execute:
+./nexus-qt
+