Add Group Aliases, group.update, and tests

Fixed

• group.delete also deletes all the aliases
• group.insert throws exception when group exists
• group.get pulls aliases from group alias records
• group.insert pulls aliases from group alias records

Changed

• group.get can find by alias
• members tests revised to use group constants and a member constant

Added

• group.update
• alias constant to group tests
• initial setup to delete any pre-existing group or update group from previous runs
• aliases values to group object to confirm group.insert does not insert aliases
• tests for group.update
• setup function to add group and group alias for testing deletion
• group.delete tests by email and alias
• group.get tests by email and alias
• version number to composer.json

Security

• updated dependencies in composer.lock