Fix Support for bundling entire directories.

Fix issue: #150
Merge pull request #189 from larsbutler/bundle-dirs

Fix Support for bundling entire directories.
zpm: only deploy ui when ui section in zapp.yaml

If the `ui` section was not present in the zapp.yaml file (default),
`zpm deploy` would try nonetheless to deploy ui files, resulting in a
crash.

This change fixes that.
Merge pull request #190 from larsbutler/fix-deploy-without-ui

zpm: only deploy ui when ui section in zapp.yaml
Merge pull request #191 from mgeisler/zpm-0.3

Updates for zpm 0.3
readme: use ``...`` instead of `...` for literal text
readme: end items with a full stop

This is more flexible in general since it allows us to make the list
items into full sentences when needed.
readme: add issues closed in the 0.2.1 release
zpm: return 1 when an error occured (fixes #195)
Merge pull request #196 from mgeisler/exit-status

zpm: return 1 when an error occured (fixes #195)
Merge pull request #193 from mgeisler/readme-fixes

Readme fixes
contrib: add jenkins build artifacts
Merge pull request #201 from larsbutler/ci-scripts

contrib: add jenkins build artifacts
debian/changelog: release version 0.3