Watch for less changes

Since less doesn’t include a watch option:

	# watch a file changes in the current directory,
	# compiles bootstrap.less

	$watcher = New-Object System.IO.FileSystemWatcher
	$watcher.Path = get-location
	$watcher.IncludeSubdirectories = $true
	$watcher.EnableRaisingEvents = $false
	$watcher.NotifyFilter = [System.IO.NotifyFilters]::LastWrite -bor [System.IO.NotifyFilters]::FileName

	while($TRUE){
	$result = $watcher.WaitForChanged([System.IO.WatcherChangeTypes]::Changed -bor [System.IO.WatcherChangeTypes]::Renamed -bOr [System.IO.WatcherChangeTypes]::Created, 1000);
	if($result.TimedOut){
	continue;
	}
	write-host "Change in " + $result.Name
	lessc —compress bootstrap.less > ..\..\public\bootstrap\css\bootstrap.min.css
	}