Adding Shamir's Shared Secret to floCrypto module
createShamirsSecretShares: create the shamirs secret shares
retrieveShamirSecret: retrives the secret from shares
verifyShamirsSecret: verify the shares with secret
Also adding randInt and randString to floCrypto module
Replaced floBlockchainAPI's readSentData, readDataPattern, readSentDataPattern, readDataContains, readSentDataContains with a improved version 'readData'
readData is Promisfied function that reads and resolves floData from blockchain using API
Arguments :
addr - address from which the floData should be read
options - (optional object, default = {})
Options :
limit - maximum number of filtered data (default = 1000, negative = no limit)
ignoreOld - ignore old txs (default = 0)
sentOnly - filters only sent data
pattern - filters data that starts with a pattern
contains - filters data that contains a string
filter - custom filter funtion for floData (eg . filter: d => {return d[0] == '$'})
