change file creation with using File.types

Author: jrainville

lib/core/config.js

@@ -191,11 +191,11 @@ Config.prototype.loadExternalContractsFiles = function() {
     if (contract.file.startsWith('http') || contract.file.startsWith('git')) {
       const url = this.getExternalContractUrl(contract);
       const localFile = httpContractDir + path.basename(url);
-      this.contractsFiles.push(new File({filename: localFile, type: "http", basedir: '', path: url}));
+      this.contractsFiles.push(new File({filename: localFile, type: File.types.http, basedir: '', path: url}));
     } else if (fs.existsSync(contract.file)) {
-      this.contractsFiles.push(new File({filename: contract.file, type: "dapp_file", basedir: '', path: contract.file}));
+      this.contractsFiles.push(new File({filename: contract.file, type: File.types.dapp_file, basedir: '', path: contract.file}));
     } else if (fs.existsSync(path.join('./node_modules/', contract.file))) {
-      this.contractsFiles.push(new File({filename: path.join('./node_modules/', contract.file), type: "dapp_file", basedir: '', path: path.join('./node_modules/', contract.file)}));
+      this.contractsFiles.push(new File({filename: path.join('./node_modules/', contract.file), type: File.types.dapp_file, basedir: '', path: path.join('./node_modules/', contract.file)}));
     } else {
       this.logger.error("contract file not found: " + contract.file);
     }
@@ -302,7 +302,7 @@ Config.prototype.loadFiles = function(files) {
     return (file[0] === '$' || file.indexOf('.') >= 0);
   }).filter(function(file) {
     let basedir = findMatchingExpression(file, files);
-    readFiles.push(new File({filename: file, type: "dapp_file", basedir: basedir, path: file}));
+    readFiles.push(new File({filename: file, type: File.types.dapp_file, basedir: basedir, path: file}));
   });
 
   var filesFromPlugins = [];
@@ -335,7 +335,7 @@ Config.prototype.loadPluginContractFiles = function() {
   contractsPlugins.forEach(function(plugin) {
     plugin.contractsFiles.forEach(function(file) {
       var filename = file.replace('./','');
-      self.contractsFiles.push(new File({filename: filename, type: 'custom', resolver: function(callback) {
+      self.contractsFiles.push(new File({filename: filename, type: File.types.custom, resolver: function(callback) {
         callback(plugin.loadPluginFile(file));
       }}));
     });

test/compiler.js

@@ -4,13 +4,12 @@ let Logger = require('../lib/core/logger.js');
 let File = require('../lib/core/file.js');
 let TestLogger = require('../lib/tests/test_logger.js');
 let assert = require('assert');
-let fs = require('fs');
 
 //let SolidityCompiler = require('../lib/modules/solidity');
 let Plugins = require('../lib/core/plugins.js');
 
 let readFile = function(file) {
-  return new File({filename: file, type: 'dapp_file', path: file});
+  return new File({filename: file, type: File.types.dapp_file, path: file});
 };
 
 describe('embark.Contracts', function() {

test/contracts.js

@@ -63,9 +63,6 @@
           100
         ]
       },
-      "ERC20": {
-        "file": "zeppelin-solidity/contracts/token/ERC20/ERC20.sol"
-      },
       "SimpleStorageTest": {
         "file": "./some_folder/test_contract.sol",
         "args": [