Beem

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* reverting change to operationsid for HF24, please uncoment line 158 in file beembase\operationids.py for using in HF25

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* More robust HIVE_CHAIN_ID detection

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* Prioritize HIVE_CHAIN_ID property for the chain selection (emre)

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* Fixed some small code issues
* Added reccurring_transfer op in preparation for HF25 (sicarius)
* Added collateralized_convert op in preparation for HF25 (sicarius)

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* Fix to parameter in transfer_to_vesting
* Improve hybrid operation in operations (pre / post HF 24 operation are supported)
* UpdateProposalExtensions has been added to Update_proposal as preperation for the next HF (thanks to drov0)
* Fix some small code issues

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* Fix bug in ecda (convert mpz into int when not supported)
* add coinactivity example script
* add blockstats example script
* Add Blocks class, which uses get_block_range
* PR 272: correct blockchain virtual op batch calls (thanks to crokkon)
* PR 276: blockchain: get_account_reputations fix for first (thanks to crokkon)
* PR 287: beempy witnessproperties: fix interest rate options (thanks to crokkon)
* Fix 289: Unable to Claim Specific Reward Asset