Merge pull request #358 from apoloval/fix/OperationsTablePlaceholder

Use a custom placeholder in operations table
Don’t crash when cannot bind to the local port
Prevent application for starting if the journal is in use
Force exit after the cannot-start dialog
Merge pull request #359 from sortega/fix_crash

Fix issues related with application start error handling
Create bitcoin.network package

This package contains the different Bitcoin network configurations that
can be configured in the application cake.
Add a NetworkComponent for the public testnet
Select bitcoin network depending on the configuration
Merge pull request #360 from sortega/prod_env

Use public testnet by default
Remove warnings on BitcoinFixture
Merge pull request #361 from sortega/warnings

Remove warnings on BitcoinFixture
Use public okpay mock by default in the GUI
Merge pull request #362 from sortega/default_okpay

Use public okpay mock by default in the GUI