renamed this metric, to emphasize that it calculates the cumulative average, which is different than the daily average.

git-svn-id: https://svn.cs.york.ac.uk/svn/ossmeter/Software/source@787 1b171192-1bc4-4300-84b6-1b6fde2e8ce3

ioannis.korkontzelos@manchester.ac.uk ioannis.korkontzelos@manchester.ac.uk 2014-01-21

removed metric-providers/org.ossmeter.metricprovider.generic.avgresponsetimeperdaypernewsgroup/src/org/ossmeter/metricprovider/generic/cumulativeavgresponsetimepernewsgroup
removed metric-providers/org.ossmeter.metricprovider.generic.avgresponsetimeperdaypernewsgroup/src/org/ossmeter/metricprovider/generic/cumulativeavgresponsetimepernewsgroup/Activator.java
removed metric-providers/org.ossmeter.metricprovider.generic.avgresponsetimeperdaypernewsgroup/src/org/ossmeter/metricprovider/generic/cumulativeavgresponsetimepernewsgroup/CumulativeAvgResponseTimePerNewsgroupProvider.java