Make max trip distance configurable by UI (#866)

[lydiascarf]

Overview

Client wanted to run interactive and batch analyses using the angularjs client without having to use the default max trip distance value of 2680 meters. This was previously only possible by setting the NB_MAX_TRIP_DISTANCE environment variable before running scripts/run-local-analysis locally.

Demo

Testing Instructions

• ./scripts/setup
• in another tab ./scripts/server
• go to http://localhost:9301/admin#/admin/analysis-jobs/create/batch/
• give it a shapefile (feel free to slack me for one) and a trip distance
• check that the logged commands have the NB_MAX_TRIP_DISTANCE you set
• check that the analysis jobs in the UI have the correct max trip distance
• go to http://localhost:9301/admin#/admin/analysis-jobs/create/
• pick a neighborhood and set a different trip distance from before
• check that the logged command has the new NB_MAX_TRIP_DISTANCE you set
• check that the analysis job in the UI has the new correct max trip distance

Checklist

• [x] Add entry to CHANGELOG.md

Resolves #866