fix: be compatible with CommonJS

Author: gregberge

packages/shipit-cli/src/index.js

@@ -1 +1,3 @@
-export { default } from './Shipit'
+import Shipit from './Shipit'
+
+module.exports = Shipit

packages/shipit-deploy/src/index.js

@@ -2,7 +2,7 @@ import deploy from './tasks/deploy'
 import rollback from './tasks/rollback'
 import pending from './tasks/pending'
 
-export default shipit => {
+module.exports = shipit => {
   deploy(shipit)
   rollback(shipit)
   pending(shipit)

packages/ssh-pool/src/index.js

@@ -1,4 +1,9 @@
-export { default as Connection } from './Connection'
-export { default as ConnectionPool } from './ConnectionPool'
-export { exec } from './util'
-export { isRsyncSupported } from './commands/rsync'
+import Connection from './Connection'
+import ConnectionPool from './ConnectionPool'
+import { exec } from './util'
+import { isRsyncSupported } from './commands/rsync'
+
+exports.Connection = Connection
+exports.ConnectionPool = ConnectionPool
+exports.exec = exec
+exports.isRsyncSupported = isRsyncSupported