Add the processing for releasing and change to latest version

First, the version of plug-in , Eclipse and so on was upadted into the present thing. 
And I added -Psign that is for release.
It is only changed in an easy-to-understand for me README.cmd file. So, I think that it may be even just to change the description of the version of the original file.

You may not merge, if my change is a function which does not suit a policy or it does not need. 
tycho-eclipse-plugin-archetype is very convenient, and wonderful. 
thank you.