Fixed BinaryClock recipe

* Use safe SOURCE_URI.
* Improved description with an explanation from the readme on how
  the hell one reads this clock. :)
* Declare add_on for the included screensaver.

haiku-apps/binaryclock/binaryclock-20141223.recipe

@@ -1,22 +1,52 @@
 SUMMARY="A binary clock application and screensaver"
-DESCRIPTION="
-A Binary Clock. And yes, you really can use this to tell time! I have found it \
-quite enjoyable to reprogram my brain to learn to read it at a glance. It just \
-takes a little getting used to.
-"
+DESCRIPTION="A Binary Clock. And yes, you really can use this to tell time! I \
+have found it quite enjoyable to reprogram my brain to learn to read it at a \
+glance. It just takes a little getting used to.
+
+How to read the Binary Clock:
+
+Each column stands for a digit in a 24 hour clock with the format: hh : mm : ss
+Each column is configured like this:
+ 8
+ 4
+ 2
+ 1
+
+so if you wanted "2", you would see: (O being off, X being on)
+ O
+ O
+ X
+ O
+
+5 would be:
+ O
+ X
+ O
+ X
+
+so 8:57:12pm would be 20:57:12 which would look like:
+ OO	 OO	 OO
+ OO	 XX	 OO
+ XO	 OX	 OX
+ OO	 XX	 XO
+
+Good Luck!"
 HOMEPAGE="http://github.com/HaikuArchives/BinaryClock"
-SOURCE_URI="git://github.com/HaikuArchives/BinaryClock#bfefbf7f93e7a07c841fdb1162e119b0364fee85"
-REVISION="2"
-LICENSE="GNU GPL v2"
 COPYRIGHT="2000 David Enderson"
+LICENSE="GNU GPL v2"
+REVISION="3"
+srcGitRev="bfefbf7f93e7a07c841fdb1162e119b0364fee85"
+SOURCE_URI="https://github.com/HaikuArchives/BinaryClock/archive/$srcGitRev.tar.gz"
+CHECKSUM_SHA256="a9e6c772b7e801d8a75a0dced08d99d04e55355d0b33c47653725ac13de99e5e"
+SOURCE_DIR="BinaryClock-$srcGitRev"
 
 ARCHITECTURES="x86_gcc2 !x86 !x86_64"
 
 PROVIDES="
 	binaryclock = $portVersion
 	app:BinaryClock = $portVersion
+	add_on:BinaryClock = $portVersion
 	"
-
 REQUIRES="
 	haiku
 	"
@@ -24,11 +54,10 @@ REQUIRES="
 BUILD_REQUIRES="
 	haiku_devel
 	"
-
 BUILD_PREREQUIRES="
 	makefile_engine
 	cmd:make
-	cmd:gcc
+	cmd:g++
 	cmd:ld
 	"