updater fixes
updater fixes

* switch to goreq for simpler download
* removed some messages during update
* ignored errors when renaming files

monkbroc/particle-cli-ng,heroku/cli-engine,monkbroc/particle-cli-ng,monkbroc/particle-cli-ng,ipmobiletech/heroku-cli,ipmobiletech/heroku-cli,heroku/cli-engine,ipmobiletech/heroku-cli,ipmobiletech/heroku-cli,heroku/cli-engine,monkbroc/particle-cli-ng