[Issue-96] Prepare for 0.5 release (#97)

Bumped Pravega/Connector version to 0.5.0 and updated Pravega sub-module commit id to r0.5 release.

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

Author: vijikarthi

gradle.properties

@@ -20,8 +20,8 @@ shadowGradlePlugin=2.0.3
 slf4jApiVersion=1.7.25
 
 # Version and base tags can be overridden at build time.
-connectorVersion=0.5.0-SNAPSHOT
-pravegaVersion=0.5.0-2223.ce3ba81-SNAPSHOT
+connectorVersion=0.5.0
+pravegaVersion=0.5.0
 
 # flag to indicate if Pravega sub-module should be used instead of the version defined in 'pravegaVersion'
 usePravegaVersionSubModule=false