Transfer multiple inputs rebase

[TimDaub]

Rebase of #120

Don't know if working appropriately.

[codecov-io]

Codecov Report

Merging #125 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
+ Coverage   82.26%   82.33%   +0.06%     
==========================================
  Files          21       21              
  Lines         282      283       +1     
==========================================
+ Hits          232      233       +1     
  Misses         50       50

Impacted Files	Coverage Δ
src/transaction/makeTransferTransaction.js	100% <100%> (ø)	⬆️

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[future-is-present]

As there are breaking changes, we will need to update everything. So I propose to handle this PR next week after we first create a new release of the JS driver including the metadata search: #124 for this week. So:

• This week new release of JS driver including and five-bells-conditions repository Full-text-search for metadata field #124
• Next week new realese of JS driver including this PR Transfer multiple inputs rebase #125 . Update of any tutorial is needed

[TimDaub]

rm merge conflict

[future-is-present]

When creating a transfer transaction the user has to specify the 'transaction' and the 'output_index' that he/she is spending. For example:

Transaction.makeTransferTransaction(
        [{ tx: transferTx, output_index: 0 }],
        [aliceOutput],
        metaData
    )

Travis do not mark this as an error, but maybe we want to change to camelcase and also change 'tx' for 'transaction':

Transaction.makeTransferTransaction(
        [{ transaction: transferTx, outputIndex: 0 }],
        [aliceOutput],
        metaData
    )

[future-is-present]

Anyways I would like to merge this PR. Is needed for sub-divisible assets. Can you @jernejpregelj check it?