Add test for watcher.js
update fsmonitor to 0.2.4
add trace log level & change filter log level (debug -> trace)
Stop watching excluded directories
Add test for previous commit
Stop watching excluded directories

LiveReloadX watches all descendant directories under the wating
directory. This may cause crash on OSX, on which we can watch at most
256 directories by default.

We want to stop watching directories excluded by filters. Fix #11.