Tidy up lighttpd formula

Based on feedback in PR #917
Drop attr support
Building with libev is no longer a supported option
Use kqueue support as it's the optimum means
sendfile support is officially supported in 10.5 but is actually
there in 10.4 but guarded off, one of the parameters is a different
type though. Play it safe.
bzip2 encoding was non-standard so skip using it.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding

Library/Formula/lighttpd.rb

@@ -11,7 +11,6 @@ class Lighttpd < Formula
   depends_on "openssl"
   depends_on "xxhash"
   depends_on "lua51" => :optional
-  depends_on "libev" => :optional
 
   # default max. file descriptors; this option will be ignored if the server is not started as root
   MAX_FDS = 512
@@ -40,13 +39,10 @@ def install
       --sbindir=#{bin}
       --with-openssl
       --with-zlib
-      --with-bzip2
-      --with-attr
       --with-xxhash
     ]
 
     args << "--with-lua" if build.with? "lua51"
-    args << "--with-libev" if build.with? "libev"
 
     system "./configure", *args
     system "make", "install"
@@ -65,12 +61,12 @@ def install
 
         s.sub!(/^server\.username\s*=\s*".+"$/, 'server.username  = "_www"')
         s.sub!(/^server\.groupname\s*=\s*".+"$/, 'server.groupname = "_www"')
-        s.sub!(/^server\.event-handler\s*=\s*"linux-sysepoll"$/, 'server.event-handler = "select"')
-        s.sub!(/^server\.network-backend\s*=\s*"sendfile"$/, 'server.network-backend = "writev"')
+        s.sub!(/^#server\.event-handler\s*=\s*"linux-sysepoll"$/, 'server.event-handler = "kqueue"')
+        s.sub!(/^#server\.network-backend\s*=\s*"sendfile"$/, 'server.network-backend = "writev"')
 
         # "max-connections == max-fds/2",
         # http://redmine.lighttpd.net/projects/1/wiki/Server_max-connectionsDetails
-        s.sub!(/^server\.max-connections = .+$/, "server.max-connections = " + (MAX_FDS / 2).to_s)
+        s.sub!(/^#server\.max-connections = .+$/, "server.max-connections = " + (MAX_FDS / 2).to_s)
       end
     end