dep: Switch from rolex to driftless

Fixes artilleryio#500.

core/lib/phases.js

@@ -11,8 +11,7 @@ const isUndefined = _.isUndefined;
 const arrivals = require('arrivals');
 const debug = require('debug')('phases');
 const crypto = require('crypto');
-const Rolex = require('rolex');
-Rolex.noConflict();
+const driftless = require('driftless');
 
 module.exports = phaser;
 
@@ -110,7 +109,7 @@ function createRamp(spec, ee) {
     let ticksElapsed = 0;
 
     let i = 0;
-    const timer = Rolex.setInterval(function maybeArrival() {
+    const timer = driftless.setDriftlessInterval(function maybeArrival() {
       let startedAt = Date.now();
       if(++ticksElapsed > ticksPerPeriod) {
         debug(`ticksElapsed: ${ticksElapsed}; upping probability or stopping`);
@@ -125,7 +124,7 @@ function createRamp(spec, ee) {
         } else {
           debug(`done: ticksElapsed = ${ticksElapsed}; currentRate = ${currentRate}; spec.rampTo = ${spec.rampTo} `);
 
-          Rolex.clearInterval(timer);
+          driftless.clearDriftless(timer);
           ee.emit('phaseCompleted', spec);
 
           /*

package.json

@@ -48,6 +48,7 @@
     "csv-parse": "^0.1.4",
     "debug": "^2.2.0",
     "deep-equal": "^1.0.1",
+    "driftless": "^2.0.3",
     "esprima": "^4.0.0",
     "filtrex": "^0.5.4",
     "js-yaml": "^3.10.0",
@@ -60,7 +61,6 @@
     "pidusage": "^1.1.6",
     "rc": "^1.1.6",
     "request": "^2.85.0",
-    "rolex": "^1.1.2",
     "socket.io-client": "^2.1.0",
     "socketio-wildcard": "^2.0.0",
     "stats-lite": "^2.1.0",