add docker files, improve dbus interface

.docker/Dockerfile-arch

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+FROM base/archlinux
+
+RUN pacman -Sy
+
+# toolchain
+RUN pacman -S --noconfirm base-devel cmake extra-cmake-modules python
+# kf5 and qt5 libraries
+RUN pacman -S --noconfirm plasma-framework
+
+# required by tests
+RUN pacman -S --noconfirm xorg-server-xvfb

.docker/Dockerfile-ubuntu

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+FROM ubuntu:16.04
+
+RUN apt-get update
+# toolchain
+RUN apt-get install -y cmake extra-cmake-modules g++ git gettext
+# kf5 and qt5 libraries
+RUN apt-get install -y libkf5i18n-dev libkf5notifications-dev libkf5service-dev \
+      libkf5windowsystem-dev plasma-framework-dev qtbase5-dev qtdeclarative5-dev \
+      plasma-framework
+
+# required by tests
+RUN apt-get install -y xvfb

.docker/build-arch.sh

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+#!/bin/bash
+
+set -e
+
+rm -rf build-arch
+mkdir build-arch
+
+# build
+cd build-arch
+cmake -DKDE_INSTALL_USE_QT_SYS_PATHS=ON -DCMAKE_BUILD_TYPE=Optimization -DCMAKE_INSTALL_PREFIX=/usr -DBUILD_FUTURE=ON -DBUILD_TESTING=ON ../sources
+make
+
+# tests
+xvfb-run make test

.docker/build-ubuntu.sh

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+#!/bin/bash
+
+set -e
+
+rm -rf build-ubuntu
+mkdir build-ubuntu
+
+# patches
+git apply patches/qt5.6-qversionnumber.patch
+git apply patches/qt5.5-qstringlist-and-qinfo.patch
+
+# build
+cd build-ubuntu
+cmake -DKDE_INSTALL_USE_QT_SYS_PATHS=ON -DCMAKE_BUILD_TYPE=Optimization -DCMAKE_INSTALL_PREFIX=/usr -DBUILD_FUTURE=ON -DBUILD_TESTING=ON ../sources
+make
+
+# tests
+xvfb-run make test