Fixed install of gems with additional install options.
Fixed syntax errors thrown in command line when install gems.

- The <(curl ...) syntax caused Bash to continously throw syntax
  errors (but the code still executes). By switching to downloading
  certs to a temporary file and then adding them, Bash no longer
  throws the syntax errors.
Removed the s3cp gem.
Removed the sprockets_better_errors gem.
Removed the web-console gem.

- This is included as of Rails 4.
Removed the holepicker gem.

- The project seems to no longer be supported or under active
  development.
Removed the doorkeeper gem.
Removed the bootstrap-sass gem.
Removed the gravatarify gem.