chore(docker): Add Dockerfile for ubuntu and helper scripts

docker/Dockerfile.ubuntu

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+FROM ubuntu:16.04
+
+RUN apt-get update && \
+    apt-get -y --force-yes install \
+    build-essential \
+    cmake \
+    git \
+    libavcodec-dev \
+    libavdevice-dev \
+    libavfilter-dev \
+    libavutil-dev \
+    libexif-dev \
+    libgdk-pixbuf2.0-dev \
+    libglib2.0-dev \
+    libgtk2.0-dev \
+    libopenal-dev \
+    libopus-dev \
+    libqrencode-dev \
+    libqt5opengl5-dev \
+    libqt5svg5-dev \
+    libsodium-dev \
+    libsqlcipher-dev \
+    libswresample-dev \
+    libswscale-dev \
+    libvpx-dev \
+    libxss-dev \
+    qrencode \
+    qt5-default \
+    qttools5-dev-tools \
+    qttools5-dev
+
+RUN git clone https://github.com/toktok/c-toxcore.git /toxcore
+WORKDIR /toxcore
+RUN git checkout v0.2.2 && \
+        cmake . && \
+        cmake --build . && \
+        make install && \
+        echo '/usr/local/lib/' >> /etc/ld.so.conf.d/locallib.conf && \
+        ldconfig
+
+COPY . /qtox
+WORKDIR /qtox
+RUN cmake . && cmake --build .

docker/build-ubuntu.sh

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+#!/bin/bash
+
+cd "$(dirname "$0")/.."
+docker build . -f docker/Dockerfile.ubuntu -t qtox
+cd -