Update hive libraries for rebranding changes that affect API method responses

Below is a list of libraries that need updating. As each library is identified, create a project for it, and add a task there to update it.

• hive-js
• hive-python
• lighthive
• Beem
• dhive
• hive-tx

Any API call that returned a response that included the word steem or sbd has been changed to substitute the words hive or hbd respectively. Please do a global search and replace for any such code in your library or app.

Here is a list of known API changes of this type (just a starting point, please add to this list as you find them):

• The fields reward_steem and reward_sbd have been renamed to reward_hive and reward_hbd in get_ops_in_block API call.
• In comment_options, percent_steem_dollars was changed to percent_hbd