Simplify handleJSendAsync
make addresses.transactions work with addresses with many transactions
extract perBatchLimit constant
make addresses.get work with many addresses
make addresses.transactions work with many addresses
remove unnecessary test
make addresses.unspents work with many addresses
remove handleJSend
push perBatchLimits to 20
Merge branch 'many-addresses'

Conflicts:
	package.json
	src/addresses.js
no need to export makeRequest

make it a internal function
batchRequest guarantees an array being returned