build: Add Travis CI for Linux

.travis.yml

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+sudo: required
+
+services:
+  - docker
+
+os:
+  - linux
+
+before_install:
+  - cd build/ci/
+  - docker pull ubuntu:xenial
+
+script:
+  - docker build -t "sparkleshare:nightly" .
+

build/ci/Dockerfile

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+FROM ubuntu:16.04
+
+RUN apt-get update
+RUN apt-get install -y \
+  desktop-file-utils \
+  git \
+  gtk-sharp3-gapi \
+  intltool \
+  libdbus-glib2.0-cil-dev \
+  libgtk3.0-cil-dev \
+  libsoup2.4-dev \
+  libtool-bin \
+  libwebkit2gtk-4.0 \
+  mono-devel \
+  mono-mcs \
+  nant \
+  xsltproc
+
+RUN git clone https://github.com/hbons/notify-sharp && \
+  cd notify-sharp/ && \
+  ./autogen.sh --disable-docs && \
+  make && make install
+
+RUN cd ../
+
+RUN git clone https://github.com/hbons/soup-sharp && \
+  cd soup-sharp/ && \
+  ./autogen.sh && \
+  make && make install
+
+RUN cd ../
+
+RUN git clone https://github.com/hbons/webkit2gtk-sharp && \
+  cd webkit2gtk-sharp/ && \
+  ./autogen.sh && \
+  make && make install
+
+RUN cd ../
+
+RUN git clone https://github.com/hbons/SparkleShare && \
+  cd SparkleShare/ && \
+  ./autogen.sh && \
+  make && make install 
+