Crea

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* Add missing trx_num to streamed block operation
* Add d.tube format to resolve_authorperm
* disable_chain_detection added to graphenerpc (for testing hivemind e.g.)
* set_next_node_on_empty_reply added to some appbase rpc calls

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* Class to access Creary Conveyor instances added by crokkon
* Option added to loed custom chains into the Crea object

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* add get_parent() to comment
* fix for creapy reward
* fix 46 (used power calculation may treat downvotes incorrectly) by crokkon
* fix 49 (discussions: set crea inst. as keyword argument) by crokkon
* Fix issue 51 (Discussions.get_discussions("blog", ...) returns the same two comments over and over)
* Fix 52 discussions.Replies_by_last_update() by crokkon
* Some bug fixes for Discussions
* Fix 54 (discussions may fail to handle empty responses correctly) by crokkon
* Snapshot improved
* Unit tests fixed
* Examples account_vp_over_time, account_reputation_by_SP
* Spelling errors fix by crokkon
* Adding account methods for feed, blog, comments and replies by crokkon
* Fix 57 (CreaConnect expects double quotes in JSON)
* Improved handling of "Client returned invalid format. Expected JSON!" erros

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* Fix issue 45 (upvote() and downvote() of a pending post/comment without vote did not work)
* fix Amount for condenser broadcast ops on appbase nodes (fixes transfer broadcast for example)
* Added get_all_replies() to Comment for fetching all replies to a post
* bemepy claimreward improved
* Amount handling in Account improved
* upvote and downvote in creapy fixed
* update_vote and build_vp_arrays added to AccountSnapshot for showing vote power history
* account_vp_over_time added to examples

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* Some bug fixes
* Unit tests using testnet fixed
* crea.snapshot improved
* Example account_sp_over_time added
* Example account_curation_per_week_and_1k_sp added
* Add block_number check to wait_for_and_get_block

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* Force refresh of chain_params on node switch
* Replace recursive call in _get_followers
* Nodelist updated and bitcoiner.me node disabled
* First testing version of crea.snapshot with example added (thanks to crokkon for his example)