* replace asn1 by asn1crypto

* Improve chain detection (Steem chain detection fixed and preparing for Hive HF24)
* Add authored_by and description fields in YAMLM header
* Improve doc
* beempy post image upload includes the markdown file path now

* Fix update_account_jsonmetadata and add posting_json_metadata property to Account
* Add Ledger Nano S support
* beempy -u activates ledger signing
* beempy -u listkeys shows pubkey from ledger
* beempy -u listaccounts searches for accounts that have pubkey derived from attached ledger
* beempy -u keygen creates pubkey lists that can be used for newaccount and changekeys
* new option use_ledger and path for Hive

add path parameter to beempy keygen

More unit tests have been added

* Add hive node
* update_account function added to blockchaininstance
* normalize added to PasswordKey, so that a Brainkey can be set as PasswordKey
* Fixed vote percentage calculation when post rshares is negative
* new beempy command changekeys
* beempy keygen can be used to generate account keys from a given password and is able to generate new passwords

* add click_shell to turn beempy into a shell utility with autocompletion
* new click_shell added as requirements

* Fix asset check in Amount and Price
* Fix get_curation_rewards for comments
* Fix empty return in _get_account_history

* HIVE nodes are now also detected as appbase ready (thanks to @crokkon)

* add steem node
* fix 'dict' object has no attribute 'split

* Fix HIVE/HBD symbols in operations

* Add workaround to allow transfers of HIVE/HBD in HIVE (opertion need to use STEEM/SBD internally)

Revert "* Add workaround to allow transfers of HIVE/HBD in HIVE (operation need to use STEEM/SBD internally)"

This reverts commit bf0c9200.

* Add workaround to allow transfers of HIVE/HBD in HIVE (operation need to use STEEM/SBD internally)

* fix EllipticCurvePublicNumbers
* Fix empty block return

Add two new hive nodes

* Fix non ascii text handling on some nodes
* Add STEEM_REVERSE_AUCTION_WINDOW_SECONDS_HF21 constant
* Fix get_curation_rewards

* 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