remove secp256k1 from circelei

testnet is not reliable, so using golos for testing

Account
* Improved some function, so that account works limited on GOLOS
Blockchain
* sync changes from python-bitshares
Instance
* sync changes from python-bitshares
Steem
* Improved some functions so that steem works on GOLOS
Chains
* Added GOLOS
graphenebase/Account
* derive256address_with_version added
ecsdasig
* Huge speed improvement (200%) by using cryptography
benchmark added
* benchmark for beemgraphenebase/account funcions
* benchmark for ecdsa
* benchmark for sign/verification of all transaction
Examples
* compare sign/verificaiton speed with steem
Unit tests
* use memo unittests from steem-js
* add key_format unittests from steem-js
* Improved the ecdsa tests

* Wallet wipe improved
* wallet purge and purgeWallet renamed to wipe
* internal node error and Unable to acquire database lock handled
* login to websocket only if username and password is provided

Account
* get_withdraw_routes added
* get_account_votes fixed for appbase
* get_vote, has_voted added
* virtual_op_count, get_curation_reward curation_stats added
* get_account_history and history_reverse added
* history improved
Blockchain
* hash_op added
CLI
* default vote weight added
* upvote added
* Info improved
Steem
* get_block_interval added
Transactionbuilder
* txbuffer.clear() added on exception
Vote
* AccountVotes fixed
GrapheneRPC
* Websocket disconnect exception handling improved
Compare_With_steem_python_account.py added
Unittests for account improved

example fixed
some block_num converted to int

test_testnet improved

Transactionbuild
* Automatic Signing with owner key removed
Beembase/account and beembase/bip38 removed as they are using beemgraphenebase/bip38 and beemgraphenebase/account

Parallel processing improved

Block
* Block contains only the json data + id for block num
* Output for appbase and non-appbase is the same
Blockchain
* batch-rpc-calls added
Graphenerpc
* multithread for websocket activated
* batch with queue  added
Benchmark improved
Unit tests adapted

rpcutils.py added
Timestamp fixed for py27
New unit tests for test_rpcutils

fix bug in comment

Amount
* fix json export
Blockchain
* improved get_estimated_block_num
Comment
* Bugfixes
Market
* Use FilledOrder for trades and recenttrades
Price
* FilledOrder fixed
* UpdateCallOrder and PriceFeed removed
Vote
* Bugfix
Unit tests
More unittests for Amount, Blockchain and comment

Limit coverage to python 3.6

Bandit passes now, added to travis
Bugfix in chain detection