utils: include confirmations in returned transactions
test: add many addresses/txs tests

The added tests are meaningful for blockr API,
but turns out do not affect the implementation of cb-helloblock.
Still nice to keep the tests the same across cb wrappers though
Merge pull request #3 from weilu/many-addresses-transactions

test: add many addresses/txs tests
Merge pull request #1 from weilu/tx-confirmations

utils: include confirmations in returned transactions
Merge pull request #2 from weilu/single-item

API allows single item instead of always demanding an array as an argument
test: add a test to show that zero-confirmation transactions are included

Conflicts:
	test/index.js