XD-547 Add AggregateCounter display

- Added AggregateCounter display command with from, to, resolution and pattern options
- Fixed missing aggregatecounter value into counts array for the given interval
 - the end time interval 'value' was not added into the counts array as the size
   calculated was missing the end time interval.
  - Fixed DeepAggregateCountResourceAssembler, RedisAggregateCounterRepository & InMemoryAggregateCounter
- Added joda-time dependency to spring-xd-rest-client project
 - Handle from/to joda time query-params in AggregateCounterTemplate