fix dependencies

Author: bgruening

homer/tools/homer_macros.xml

@@ -10,10 +10,8 @@
     </xml>
     <xml name="requirements">
         <requirements>
-            <requirement type="package" version="35x1">blat</requirement>
-            <requirement type="package" version="2.8.2">weblogo</requirement>
-            <requirement type="package" version="9.07">ghostscript</requirement>
-            <requirement type="package" version="5.18.1">perl</requirement>
+            <requirement type="package" version="0.1.18">samtools</requirement>
+            <requirement type="package" version="4.2">homer</requirement>
         </requirements>
     </xml>
 </macros>