Merge branch 'master' into eosio_build_centos

Merging master

contracts/bancor/README.md

-eosio.system
-----------
-
-This contract enables users to stake tokens, and then configure and vote on producers and worker proposals. 
-
-Users can also proxy their voting influence to other users.
-
-The state of this contract is read to determine the 21 active block producers. 
-
-Actions:
-The naming convention is codeaccount::actionname followed by a list of paramters.
-
-Indicates that a particular account wishes to become a producer
-## eosio.system::cfgproducer    account config
-   - **account** the producer account to update
-   - updates the configuration settings for a particular producer, these
-
-   Storage changes are billed to 'account'
-   
-## eosio.system::okproducer     account producer vote
-   - **account** the account which is doing the voting
-   - **producer** the producer which is being voted for (or unvoted for)
-   - **vote** true if the producer should be voted for, false if not
-
-   Each account has a maximum number of votes it can maintain. Storage changes will be billed to 'account'
-
-## eosio.system::setproxy       account proxy
-   - **account** the account which is updating it's proxy
-   - **proxy** the account which will have the power to vote account's stake
-
-   All current votes are removed and a new proxy link is created. The votes for every producer the proxy
-   has voted for are updated immediately.
-
-   Storage changes will be billed to 'account'
-
-## eosio.system::unstake        account quantity 
-   - **account** - the account which is requsting their balance be unstaked
-   - **quantity** - the quantity which will be unstaked, unstaked tokens lose voting influence immediately
-
-   - in order to unstake tokens, an account must request them. The user will receive them over
-     time via weekly withdraws. The length of time will be configured by the median time as set by
-     the active producers.
-
-   - If this is called while in the process of unstaking, the currently pending unstake is canceled as if
-     quantity were 0, then it is applied as if a new unstake request was made.
-
-   - all producers this 'from' has voted for will have their votes updated immediately.
-
-   - bandwidth and storage for the deferred transaction will be billed to 'from'
-
-## eosio.system::withdraw account
-   - this action can only be triggered by eosio.system via a deferred transaction generated by unstake
-   - this will generate an inline eosio.token::transfer call from=eosio.system to=account and amount equal to the next withdraw increment
-   - this will generate another deferred withdraw to continue the process if there are still withdraws to be made
-
-
-## eosio.system::transfer from to amount memo
-   - decrements balance of from if amount <= balance
-   - increments balance of to by amount
-   - memo is ignored 
-
-## eosio.system::stakevote account amount
-   - the primary currency of eosio is controlled by the token contract which enables users to transfer
-     balances from one user to another. The receiver is notified on incoming balances and the vote contract
-     will stake the tokens on receipt.
-
-   - all producers this 'from' has voted for will have their votes updated immediately.
-
-
-## eosio.system::onblock   account blocktime blocknum
-   - this special action is triggered when a block is applied by the given producer and cannot be generated from
-     any other source. It is used to pay producers and calculate missed blocks of other producers. 
-
-   - producer pay is deposited into the prodcer's stake balance and can be withdrawn over time.
-
-   - if blocknum is the start of a new round this may update the active producer config from the producer votes.
-
-## eosio.system::freeze producer accounts true|false 
-   - requires permission of the @producers account 
-   - if an account is frozen, all authorizations of that account are rejected and the code for that account will not be run
-
-## eosio.system::paystandby producer
-   - every block some amount of tokens is paid 
-   - at most once per day a producer may claim a percentage of the standby pay equal to their totalvotes / allvotes