[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
[CB-3569] Allow FileTransfer.upload to reference android_assets
CB-3548: Throwing this one over the fence, but this change appears sane.  We should just return false.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/cordova-android
Forgot to update this so that it doesn't destroy someone's project, FAIL
CB-3420: add hidden option to InAppBrowser