New: Highlight message count only for new messages

Currently the number of messages is shown with a red background
independent of the number of unread messages. With this change it stays
gray/blue as long as the message count equals '0'.
separate css styles for each counter
New: Unfocus searchbox after loading

Some people (like me) are using vimperator and the autofocus grabs to
focus so that we cannot use keys to control vimperator anymore. I'm not
sure if some people like the autofocus to start searching immediately
after visiting osm.org.
Merge branch 'nofocus' of https://github.com/SammysHP/osm-clean-ui into SammysHP-nofocus

Conflicts:
	17415.user.js
Fix highlighting of counters

The change introduced in 794e229dde2f02a1288eef6c8395b34870714985
doesn't work because it iterates over the wrong elements on the profile
page.
This commit iterates directly over all 'count-number' elements and adds
a new class for highlighting if the element is not equal to '0'. This
means that it does not only fix the bug but also simplifies the code a
lot.
Merge pull request #9 from SammysHP/counters

Fix highlighting of counters