[issue-203] Prepare for 0.5 release (#208)

Updated pravega, connectors and samples version label to 0.5.0.

Signed-off-by: Vijay Srinivasaraghavan <vijayaraghavan.srinivasaraghavan@emc.com>

gradle.properties

@@ -8,18 +8,18 @@
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 ### Pravega dependencies
-pravegaVersion=0.5.0-2223.ce3ba81-SNAPSHOT
+pravegaVersion=0.5.0
 
 ### Pravega-samples output library
-samplesVersion=0.5.0-SNAPSHOT
+samplesVersion=0.5.0
 
 ### Flink-connector dependencies
-flinkConnectorVersion=0.5.0-75.01ba05e-SNAPSHOT
+flinkConnectorVersion=0.5.0
 flinkVersion=1.7.2
 flinkScalaVersion=2.12
 
 ### hadoop connector dependencies
-hadoopConnectorVersion=0.5.0-29.d6fa817-SNAPSHOT
+hadoopConnectorVersion=0.5.0
 
 ### Samples application dependencies
 hadoopVersion=2.8.1