Update gulp to use production NODE_ENV for React import in staging.

[sharkinsspatial]

• Description: Context useful to identifying priority of request (specific resolution required, date that needs to be hit, etc). Please note quality of Bing imagery,Mapbox and other imagery sources over same location in this section.

• Wiki link: link to relevant wiki for activation

• Request extent: Link to gist map showing exact extent being requested. Please include screenshot below.

• Issue with current imagery quality:

  • [ ] Clouds
  • [ ] Blank tiles (no imagery)
  • [ ] Black and white imagery
  • [ ] Outdated imagery
  • [ ] Other: please fill in description here

• Level of urgency:

  • [ ] Low
  • [ ] Medium
  • [ ] High

• Requirement of Post imagery:

  • [ ] Yes
  • [ ] No