add link to new documentation

[shinobu]

This pull request adds a link to the new documentation

[white-gecko]

The README ist still important, so the phrase "This documentation …" is not good. It should just be a prominent link to the documentation. I've already disabled the wiki here on GitHub,

[shinobu]

oh sorry, i didn't know it was already deactivated, gonna change that in a sec

[white-gecko]

I think the link should be more prominent. Maybe you add an extra section before the Introduction.

[shinobu]

you can check it again @white-gecko

[white-gecko]

The documentation link should go to the top of the README file. And please squash the commits.

[shinobu]

I added the link at the top, put the ##Documentation at the bottom (the notice about how they can propose changes is in my point of view important)

[white-gecko]

Please check it again! Build-Status is now linked to docs.ontowiki.net. You could also update the build status using the travis icons.

[shinobu]

I have literary no idea how that even could have happened. Fixed it, added the Travis build status (still kept the owdev one for now), changed the look so that it resembles Erfurt

should be ok now @white-gecko

[white-gecko]

I'd like to care for this ;-)

[white-gecko]

The actual images can be seen in my comment

[white-gecko]

@pfrischmuth works, it was the rawgit cache delaying the delivery of the SVG files.