Signed-off-by: Brian of London <brian@podping.org>

* Add new operation ids for HF 24
* Remove remaining py2 code
* Run unit tests on beta.openhive.network
* Fix compatibility issues with HF 24
* account get_follow_count, get_followers and get_following have been fixed

- Added update_proposal_operation
- Fixed copy/paste error in remove_proposal

* Improved community selection in beempy createpost
* Improved Transactionbuilder object representation
* _fetchkeys function moved outside appendSigner
* Fix get urls in parse body
* Two more nodes have been added to nodelist

* operations for account_update2, create_proposal, update_proposal_votes and remove_proposal were added
* update_proposal_votes was added to steem
* update_account_jsonmetadata was added to account
* new beempy delete were added

RawString added to types
Some improvements and fixes

All parameter are packed now in a correct way
Correct operationid for Witness_set_properties

objects.Amount
* naming of symbol and asset improved

Example for using offline signing is provided
Next release prepared

Account
* print_info improved (Last Vote added)
* entryId changed to start_entry_id in get_feed, get_blog_entries and get_blog
*rpc.get_account_history moved to _get_account_history
* estimate_account_op added, can be used to fastly get account op numbers from dates or block nums
* history and history_reverse uses estimate_account_op
Exception
* KeyNotFound removed
Memo
* raises MissingKeyError instead of KeyNotFound
Price
* small improvement
Steem
* __repr__ added
Transactionbuilder
* get_potential_signatures, get_transaction_hex and get_required_signatures added
* raises MissingKeyError instead of KeyNotFound
VotesObject
* __contains__, __str__ and __repr__ added
Wallet
* raises MissingKeyError instead of KeyNotFound
Witness
* __contains__, __str__ and __repr__ added to WitnessObject
Steemnoderpc
* small improvements
Operationsid
* producer_reward added
Unit tests
* new function added and tests adapted to changes