update .gitignore excluding generated files

- env/dev - development only files regenerated by re-natal
- index.*.js
- figwheel-server.log

re-natal.coffee

@@ -217,6 +217,10 @@ copyFigwheelBridge = (projNameUs) ->
   exec "cp #{resources}figwheel-bridge.js ."
   edit "figwheel-bridge.js", [[projNameUsRx, projNameUs]]
 
+updateGitIgnore = () ->
+  fs.appendFileSync(".gitignore", "\n# Generated by re-natal\n#\nenv/dev\nindex.android.js\nindex.ios.js")
+  fs.appendFileSync(".gitignore", "\n# Figwheel\n#\nfigwheel_server.log")
+
 init = (projName) ->
   if projName.toLowerCase() is 'react' or !projName.match validNameRx
     logErr 'Invalid project name. Use an alphanumeric CamelCase name.'
@@ -302,6 +306,8 @@ init = (projName) ->
            \"require('react-native/local-cli/cli').init('.', '#{projName}')\"
            "
 
+    updateGitIgnore()
+
     generateConfig projName
 
     copyFigwheelBridge(projNameUs)