added a count of open prs and overdue ones under header
Merge pull request #172 from rhyolight/add-pr-count

added a count of open prs and overdue ones under header
- Adds translation license.
- Links to CLA white paper changed.
Small change.
Added Azat to contrib list.
added azatnur username to contrib list
Small changes to the license.
Merge pull request #180 from carlfriess/TranslationLicense

- Adds translation license.
Adds target_url to tools/pullrequests.html
Design improvement.
Stylesheet added.
Small change.
Merge pull request #183 from carlfriess/tools-PR

Adds target_url to tools/pullrequests.html