Boston-based Mustbin Inc., a security-focused mobile app maker founded by local entrepreneur Brian Shin, announced Wednesday it has sold its technology assets to a Silicon Valley startup. Mountain View-based LifeSite Inc. bought Mustbin's tech, which allows smartphone users to encrypt and securely store their data in the cloud, for an undisclosed amount. As of July 30, all Mustbin users will have to create a LifeSite Vault account to continue to access their information. No Mustbin employees will...