Added new OHLC and LTP API calls to fetch data for multiple instruments at once.

New features:-

1. Added OHLC fetch API for multiple(up to 200) instruments at once.
2. Added LTP fetch API for multiple(up to 200) instruments at once.

Breaking changes:-

1. Get Holdings API will return a list of holdings instead of holdings object.
2. Get Positions will return a map with day and net positions.
3. Get Orderbook will return a list of orders instead of single order object.
4. Get trades will return a list of trades instead of a single trades object.
5. Get trades for an order will return a list of trades instead of a single object.
6. Get Mutual Funds orders will return a list of orders.
7. Get Mutual Funds SIPs will return a list of SIPs.

Updated examples are here https://github.com/rainmattertech/javakiteconnect/blob/master/sample/src/Examples.java