SSDM-559: using gradle 1.8 for 'deep_sequencing_unit'

SVN: 31912

deep_sequencing_unit/gradle/wrapper/gradle-wrapper.properties

-#Wed Oct 09 09:45:18 CEST 2013
+#Wed Apr 30 12:57:17 CEST 2014
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://svncisd.ethz.ch/repos/cisd/ivy-repository/trunk/gradle/distribution/1.5/gradle-1.5-bin.zip
+distributionUrl=http\://svncisd.ethz.ch/repos/cisd/ivy-repository/trunk/gradle/distribution/1.8/gradle-1.8-all.zip