Support Timestamp type in HiveSchemaConverter

[AhmedKamal]

Avro is now supporting Timestamp data type in 1.8.1 version but kite-sdk is still not able to handle timestamp data types and is depending on an older version of Avro.

Exception Stack trace while trying to convert Hive Table containing Timestamp to Avro

java.lang.IllegalArgumentException: Cannot convert unsupported type: timestamp

at org.kitesdk.shaded.com.google.common.base.Preconditions.checkArgument(Preconditions.java:115)
at org.kitesdk.data.spi.hive.HiveSchemaConverter.convert(HiveSchemaConverter.java:199)
at org.kitesdk.data.spi.hive.HiveSchemaConverter.convertField(HiveSchemaConverter.java:173)
at org.kitesdk.data.spi.hive.HiveSchemaConverter.convertTable(HiveSchemaConverter.java:132)