Move download to `npm run downloadsolc`

.travis.yml

@@ -2,7 +2,7 @@ language: node_js
 node_js:
   - stable
 script:
-  - npm run lint && npm run test && npm run build
+  - npm run lint && npm run test && npm run downloadsolc && npm run build
   - ./ci/browser_tests.sh
 deploy:
   provider: script

package.json

@@ -9,7 +9,8 @@
     "browser-test-remote-ie": "nightwatch --config nightwatch.js --env ie",
     "browser-test-remote-chrome": "nightwatch --config nightwatch.js --env chrome",
     "browser-test-remote-safari": "nightwatch --config nightwatch.js --env safari",
-    "build": "mkdir -p build; rm soljson.js; wget https://ethereum.github.io/solc-bin/soljson.js; browserify src/index.js -g yo-yoify -o build/app.js",
+    "build": "mkdir -p build; browserify src/index.js -g yo-yoify -o build/app.js",
+    "downloadsolc": "rm soljson.js; wget https://ethereum.github.io/solc-bin/soljson.js",
     "lint": "semistandard",
     "serve": "http-server ."
   },