add app description to manifest to support p2p distribution

This allows other methods of distributing APKs to also include the
description text, like the FDroid local repo swapping.
document jar sources

This .properties file is supported by the Android tools as a means to point
towards the javadoc for a given jar.  I've extended it to include a pointer
to the original download link and the source repo.
created class LilDebiAction which will create/start/stop Debian instead of class LilDebi
make-release-build: use git tools for more flexible cleaning
move jenkins build script to git
ignore = dirty in submodules
update translations: de es no
add translations: it pt_PT sk

thanks to Damtux, (Manuela Silva) alfalb_mansil, and (Jakub Srna) Krantišek
jenkins-build: use date for versionCode and add date to versionName
Intent Registration in AndroidManifest.xml

Earlier Intent was registered only when LilDebi Activity was started.
So we have moved it to AndroidManifest.xml, so that Intent will be registered when application in installed