Adds an option to enable or disable sentry error
reporting under Advanced section in General Settings.
Handles both main and renderer processes.
Also, changes the domain used to resolve proxy
in proxy-util from google.com to example.com.
Fixes#702.
captureExceptions are used to report expected exceptions from domain-util.js and
config-util.js.
All files that include logger-util automatically includes sentry for those files
and report unexpected exceptions to sentry.
