Fixed avail_out == 0 conditional not returning need_more in deflate_quick.

Fixed avail_out == 0 conditional not returning need_more in deflate_quick.
Fixed ending block when returning need_more caused problems with inflate.

So instead of ending the block each time the function returns to finish the last block, we check upon start to see if it is the last block and if the last block has been started, and if not it will close the previous block and start the last block.