Increase hover time required to expand globalnavbar

I [experimented with different hover times](http://jsfiddle.net/burke/8uatX/embedded/result/) and 1000 ms (at least 800 ms) feels better than 400 ms.  When on the OpenMRS website with a 400 ms threshold, I am still finding that the globalnavbar often expands unintentionally, especially as Confluence has moved more functionality into their header.