* Add Sentry config and ErrorBoundary Component
* Update travis file to upload sentry sourcemaps
* Add design implementation for ErrorBoundary
* Add Sentry DSN configuration for all networks
* Push sourcemaps to sentry only on staging/production build
* move isProdction to constants file
* change Button for Link
* fix redirect when safeAddress is provided but not a subpath for it.
Co-authored-by: Daniel Sanchez <daniel.sanchez@gnosis.pm>