Added buildInstructions for Ubuntu 14.04

doc/buildInstructions/Ubuntu/Ubuntu_14.04

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+Below are build instructions for Ubuntu 14.04.
+
+These instructions assume that you install in the default location, which is 
+~/foam/ . Create this folder with:
+
+    cd ~
+    mkdir foam
+
+
+* Obtain and unpack source code (if you read this, you probably already have):
+
+The recommended way is to get the source code through git source code 
+management system. This way, you can get updates and bugfixes easily by running
+"git pull". To install into the default location run: 
+
+    cd ~/foam
+    git clone git://git.code.sf.net/p/openfoam-extend/foam-extend-3.0 
+
+
+Alternatively, you can download a snapshot (.tgz) of the source code from:
+http://sourceforge.net/projects/openfoam-extend/files/foam-extend-3.0/
+
+
+* Install required packages:
+
+    sudo apt-get install git-core build-essential binutils-dev flex bison \ 
+    zlib1g-dev qt4-dev-tools libqt4-dev libncurses5-dev libiberty-dev \
+    libxt-dev rpm mercurial graphviz
+
+Make an additional link:
+
+    sudo ln -s /usr/bin/make /usr/bin/gmake
+
+* Set environment variables:
+
+    cd ~/foam/foam-extend-3.0
+    . etc/bashrc
+
+Optionally, set environment variable for Qt to compile ParaView: 
+
+    export QT_BIN_DIR=/usr/bin
+
+Optionally, set environment variable for compiling Cuda solvers, for example
+(replace "sm_30" with value according to your GPU architecture): 
+
+    export CUDA_ARCH=sm_30
+
+
+* Compile:
+
+    ./Allwmake.firstInstall
+
+
+* Create user directory:
+
+    mkdir -p $FOAM_RUN
+
+
+And you are ready to start.