combineTransactionInfo memory usage

[braydonf]

Large queries with many transactions can lead to:

<--- Last few GCs --->

 1999525 ms: Scavenge 1394.6 (1455.4) -> 1394.6 (1455.4) MB, 0.7 / 0 ms (+ 2.3 ms in 1 steps since last GC) [allocation failure] [incremental marking delaying mark-sweep].
 2000193 ms: Mark-sweep 1394.6 (1455.4) -> 1394.1 (1455.4) MB, 668.1 / 0 ms (+ 3.2 ms in 2 steps since start of marking, biggest step 2.3 ms) [last resort gc].
 2000854 ms: Mark-sweep 1394.1 (1455.4) -> 1394.4 (1455.4) MB, 661.1 / 0 ms [last resort gc].


<--- JS stacktrace --->

==== JS stack trace =========================================

Security context: 0x34a381c37399 <JS Object>
    1: combineTransactionInfo [/home/testuser/bitcore-node/lib/services/address/history.js:~122] [pc=0x16517e689647] (this=0x3235e0570389 <an AddressHistory with map 0x2681979dc3d1>)
    2: /* anonymous */ [/home/testuser/bitcore-node/lib/services/address/history.js:49] [pc=0x16517e64dd8a] (this=0x34a381cb7909 <JS Global Object>,err=0x34a381c04111 <null>)
    4: /* anonymous */ [/home/testuser/bit...

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory
Aborted (core dumped)

[braydonf]

Was converted to use streams.