[CB-3561] Update documentation comments to match implementation

Affects CordovaInterface and CordovaActivity. There should probably be a
concerted effort to update this across the entire project.
[CB-3563] Change default logging tag from DroidGap to CordovaActivity
[CB-3563] Replace instances of DroidGap in log messages with more appropriate symbols
[CB-3563] Update references to DroidGap in code comments