Add Travis CI and some tests

* Travis CI configuration
* Add arch-pacaur Docker image.
* Add basic package tests.

.travis.yml

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+sudo: required
+language: bash
+
+services:
+  - docker
+
+before_install: docker build -t arch-pacaur tests/image
+
+env:
+  - TEST="make && sudo make install"
+  - TEST="tests/test_packages.sh"
+
+script: docker run -v $(pwd):/home/pacaur/pacaur arch-pacaur /bin/bash -lc "sudo chown -R pacaur .; $TEST"

tests/image/Dockerfile

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+FROM base/devel
+# update the image and install pacaur dependencies
+RUN pacman -Syu --noconfirm
+RUN pacman -S --noconfirm git expac
+
+# prepare the pacaur environment
+RUN useradd -m pacaur
+RUN echo 'pacaur ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers
+
+# build cower
+USER pacaur
+WORKDIR /home/pacaur
+RUN git clone https://aur.archlinux.org/cower.git
+WORKDIR /home/pacaur/cower
+RUN gpg --recv-keys --keyserver hkp://pgp.mit.edu 1EB2638FF56C0C53
+RUN makepkg -sri --noconfirm
+
+RUN mkdir -p /home/pacaur/pacaur
+WORKDIR /home/pacaur/pacaur

tests/test_packages.sh

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+#!/bin/bash
+
+##
+# Test command given as argument.
+#
+# $1 = command
+##
+test_command()
+{
+    COMMAND="$1 &> /dev/null"
+    if eval $COMMAND;then
+        echo OK
+    else
+        echo FAILED
+        ANY_FAILED=true
+    fi
+}
+
+SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"
+# Use this repository pacaur script by default
+if [ -z ${PACAUR} ]; then PACAUR="${SCRIPTPATH::-5}pacaur"; fi
+# Track any error
+ANY_FAILED=false
+# Packages to be processed
+PACKAGES="shellcheck-static"
+
+echo "Testing operation with packages:"
+echo -n "Update system..."
+test_command "${PACAUR} -Syu --noconfirm"
+echo -n "Install packages..."
+test_command "${PACAUR} -S --noconfirm --noedit ${PACKAGES}"
+echo -n "Uninstall packages..."
+test_command "${PACAUR} -R --noconfirm ${PACKAGES}"
+
+if ${ANY_FAILED}; then exit 1; else exit 0; fi