qx contrib publish: allow overriding of version number

[johnspackman]

From @cboulanger on November 28, 2017 8:17

qx contrib publish at the moment increments the existing version number according to the release type (major, minor, patch ...). We should add a -V/--version option that allows to manually set the version number.

Copied from original issue: qooxdoo/qooxdoo-cli#47

[johnspackman]

From @cboulanger on December 1, 2017 13:32

A contrib should have a demo, which allows to see what it does and could be used in unit tests for quality control. qx contrib publish will warn if there isn't one and recommend to add it via qx contrib init

[johnspackman]

From @cboulanger on December 1, 2017 15:2

More changes:

• qx contrib publish should also allow to enter a custom release message
• in the confirmation, add the release type (major, minor,...) to the confirmation message

[cboulanger]

Already implemented, closing.