Revert "S3 eco (#170)"

[godwinpang]

This reverts commit 20931a5.

Heroku build failing with

FATAL ERROR: MarkCompactCollector: young object promotion failed Allocation failed - JavaScript heap out of memory
 1: 0xa04200 node::Abort() [node]
 2: 0x94e4e9 node::FatalError(char const*, char const*) [node]
 3: 0xb797be v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [node]
 4: 0xb79b37 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [node]
 5: 0xd343c5  [node]
 6: 0xd64f5e v8::internal::EvacuateNewSpaceVisitor::Visit(v8::internal::HeapObject, int) [node]
 7: 0xd70f96 v8::internal::FullEvacuator::RawEvacuatePage(v8::internal::MemoryChunk*, long*) [node]
 8: 0xd5d17f v8::internal::Evacuator::EvacuatePage(v8::internal::MemoryChunk*) [node]
 9: 0xd5d3f8 v8::internal::PageEvacuationTask::RunInParallel(v8::internal::ItemParallelJob::Task::Runner) [node]
10: 0xd4fcd9 v8::internal::ItemParallelJob::Run() [node]
11: 0xd72ef0 void v8::internal::MarkCompactCollectorBase::CreateAndExecuteEvacuationTasks<v8::internal::FullEvacuator, v8::internal::MarkCompactCollector>(v8::internal::MarkCompactCollector*, v8::internal::ItemParallelJob*, v8::internal::MigrationObserver*, long) [node]
12: 0xd7378c v8::internal::MarkCompactCollector::EvacuatePagesInParallel() [node]
13: 0xd73955 v8::internal::MarkCompactCollector::Evacuate() [node]
14: 0xd85941 v8::internal::MarkCompactCollector::CollectGarbage() [node]
15: 0xd41c68 v8::internal::Heap::MarkCompact() [node]
16: 0xd43758 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node]
17: 0xd46b9c v8::internal::Heap::AllocateRawWithRetryOrFailSlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [node]
18: 0xd1527b v8::internal::Factory::NewFillerObject(int, bool, v8::internal::AllocationType, v8::internal::AllocationOrigin) [node]
19: 0x105b26f v8::internal::Runtime_AllocateInYoungGeneration(int, unsigned long*, v8::internal::Isolate*) [node]
20: 0x1401239  [node]
Aborted