Added most functions of elliptics-proxy to binding

Implemented classes:
 - dned_id
 - key_t
 - lookup_result_t
 - data_container_t
 - async_read_result_t
 - async_write_result_t
 - async_remove_result_t
 - elliptics_proxy_t

Implemented functions of elliptics_proxy_t:
 - lookup
 - read
 - write
 - remove
 - range_get
 - bulk_read
 - lookup_addr
 - bulk_write
 - exec_script
 - read_async

and most of them was tested