fix: run geth and parity in archival mode for dev nodes

This will only be enabled for test networks in order to be able to debug
transactions that have occurred in the past.

packages/embark/src/lib/modules/blockchain_process/gethClient.js

@@ -73,6 +73,10 @@ class GethClient {
       cmd.push("--syncmode=" + config.syncMode);
     }
 
+    if(this.runAsArchival(config)) {
+      cmd.push("--gcmode=archive");
+    }
+
     if (config.account && config.account.password) {
       const resolvedPath = path.resolve(fs.dappPath(), config.account.password);
       cmd.push(`--password=${resolvedPath}`);
@@ -135,6 +139,10 @@ class GethClient {
     return cmd;
   }
 
+  runAsArchival(config) {
+    return config.networkId === 1337 || config.archivalMode;
+  }
+
   initGenesisCommmand() {
     let config = this.config;
     let cmd = this.bin + " " + this.commonOptions().join(' ');

packages/embark/src/lib/modules/blockchain_process/parityClient.js

@@ -102,6 +102,10 @@ class ParityClient {
       }
     }
 
+    if(this.runAsArchival(config)) {
+      cmd.push("--pruning=archive");
+    }
+
     return cmd;
   }
 
@@ -127,6 +131,10 @@ class ParityClient {
     return parsed;
   }
 
+  runAsArchival(config) {
+    return config.networkId === 1337 || config.archivalMode;
+  }
+
   isSupportedVersion(parsedVersion) {
     let test;
     try {