give travis 10 seconds to start server

IPython/html/tests/casperjs/util.js

@@ -109,7 +109,7 b' casper.notebook_test = function(test) {'
     });
 };
 
-casper.options.waitTimeout=5000
+casper.options.waitTimeout=10000
 casper.on('waitFor.timeout', function onWaitForTimeout(timeout) {
     this.echo("Timeout for " + casper.get_notebook_server());
     this.echo("Is the notebook server running?");