Added scripts to build AppImage & build instructions

docs/AppImage_Build.md

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+# PyBitmessage AppImage Build instructions
+
+## Requirements
+First make sure you have `dpkg` and `appimagetool` installed.
+From packages/AppImage/ Dir run `install.sh` to install the appimagetool.
+```
+sudo ./install.sh
+```
+
+## Build and Install
+
+This script requires PyBitmessage .deb package.
+Download the latest version from https://storage.bitmessage.org/binaries/
+
+Once you have downloaded the package and have `dpkg` and `appimagetool` installed:
+
+You can start to build the appimage
+
+### Clone the source code
+```
+git clone git://github.com/Bitmessage/PyBitmessage.git
+```
+This will install the base app to your local flatpak user repository, it 
+takes a while to compile because QT4 and PyQt4 have to be build, among others. But this is only required once.
+
+### Build
+
+Run build.sh
+Usage:  ./build.sh "path to deb package"
+Example  ./build.sh ~/Downloads/pybitmessage_0.6.3.2-1_amd64.deb 
+
+```
+cd PyBitmessage/packages/AppImage
+./build.sh ~/Downloads/pybitmessage_0.6.3.2-1_amd64.deb 
+```
+
+# Run
+```
+./PyBitmessage-x86_64.AppImage
+```
+
+## Cleanup
+The script performs a cleanup, deletes the intermediate AppDir & tmp files.

packages/AppImage/AppRun

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+#!/bin/sh
+
+SELF_DIR="$(dirname "$(readlink -f "$0")")"
+cd "$SELF_DIR/usr/bin/"
+exec "pybitmessage"

packages/AppImage/build.sh

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+#!/bin/sh
+
+#####################################################################
+# Usage:  ./build.sh "path to deb package"
+# Example  ./build.sh ~/Downloads/pybitmessage_0.6.3.2-1_amd64.deb 
+#####################################################################
+
+#CleanUp Old Builds 
+rm -rf AppDir/
+rm -rf tmp/
+
+mkdir AppDir
+mkdir tmp
+
+echo 'Building from inputFile:' $1 
+
+dpkg -x $1 tmp/
+
+mv tmp/usr/ AppDir/usr/
+cp AppRun AppDir/
+cp AppDir/usr/share/applications/pybitmessage.desktop AppDir/
+cp AppDir/usr/share/icons/hicolor/24x24/apps/pybitmessage.png AppDir/
+ARCH=x86_64 appimagetool AppDir/
+
+##Clean-up
+rm -rf AppDir/
+rm -rf tmp/
+
+echo "Build Successful"
+echo "Run ./PyBitmessage-x86_64.AppImage"

packages/AppImage/install.sh

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+#!/bin/sh
+
+wget -O "appimagetool" "https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage"
+chmod a+x appimagetool
+mv appimagetool /usr/bin/