Ability to test different kinds of browsers was added

Previously the tests ran only on Firefox, now it's possible to specify what
browsers we want to test (by default it's still only FF). See README for
more details.

Didn't test whether the tests actually pass on IE, would be great if someone
checks that.
[Se Monitoring] Updated IE MBeans to name the browser as iexplorer

First of all it didn't work with JMX well because previously there was a space
in the bean name. Second - by default the actual capability is
browserName=iexplorer, so the name was originally wrong in the code.