update install doc for ubuntu
clean up useless diffs
Complain if ant is too old.
Merge pull request #314 from steven-aerts/fail_on_old_ant

Complain if ant is too old.
Merge pull request #307 from midopa/master

adding some install notes for ubuntu
Using aapt to unsign apk-files instead of the unsign-jar. This enables us to resign Xamarin apps as well.
Bumping version to 0.4.17
Adding a helpful error message when no keystore is found
Bumping version to 0.4.18
Extracting package name and main activity using aapt instead of apk_tools. Also removing the never documented 'extract-manifest' operation.
Fixing a bug where no other property than css and xpath could be used with webviews
Releasing 0.4.19.pre1
Trimming uiquery input
Merge remote-tracking branch 'cba-main/master'