Merge pull request #39 from atlesn/master

New version
Add download explanation for Ubuntu 14.04 LTS (Trusty Tahr)
Merge branch 'master' of https://github.com/P-star/P-star
Update download page
Update news
Merge pull request #40 from atlesn/master

Bugfix for bitwise AND operator &.
Updated documentation
Fix problems with STDIN which did not work after we began to call assign operator on the right side.
Merge branch 'master' of https://github.com/P-star/P-star