removed @Override annotations which are not Java 5 compliant

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1003027 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/math/distribution/BetaDistributionImpl.java

@@ -89,13 +89,11 @@ public class BetaDistributionImpl
     }
 
     /** {@inheritDoc} */
-    @Override
     public double getAlpha() {
         return alpha;
     }
 
     /** {@inheritDoc} */
-    @Override
     public double getBeta() {
         return beta;
     }

src/main/java/org/apache/commons/math/distribution/ExponentialDistributionImpl.java

@@ -71,7 +71,6 @@ public class ExponentialDistributionImpl extends AbstractContinuousDistribution
     /**
      * {@inheritDoc}
      */
-    @Override
     public double getMean() {
         return mean;
     }

src/main/java/org/apache/commons/math/distribution/GammaDistributionImpl.java

@@ -139,7 +139,6 @@ public class GammaDistributionImpl extends AbstractContinuousDistribution
     /**
      * {@inheritDoc}
      */
-    @Override
     public double getAlpha() {
         return alpha;
     }
@@ -147,7 +146,6 @@ public class GammaDistributionImpl extends AbstractContinuousDistribution
     /**
      * {@inheritDoc}
      */
-    @Override
     public double getBeta() {
         return beta;
     }