Replaced sure() invocations with '!!' operator in libraries written on Kotlin.

libraries/kotlin-jdbc/src/main/kotlin/kotlin/jdbc/Connections.kt

@@ -8,7 +8,7 @@ import java.util.Properties
 /**
  * create connection for the specified jdbc url with no credentials
  */
-fun getConnection(url : String) : Connection = DriverManager.getConnection(url).sure()
+fun getConnection(url : String) : Connection = DriverManager.getConnection(url)!!
 
 /**
  * create connection for the specified jdbc url and properties

libraries/kotlin-jdbc/src/main/kotlin/kotlin/jdbc/ResultSets.kt

@@ -47,7 +47,7 @@ fun <T> ResultSet.map(fn : (ResultSet) -> T) : jet.Iterable<T> {
  * Returns array with column names
  */
 fun ResultSet.getColumnNames() : jet.Array<String> {
-    val meta = getMetaData().sure()
+    val meta = getMetaData()!!
     return jet.Array<String>(meta.getColumnCount(), {meta.getColumnName(it + 1) ?: it.toString()})
 }