added merge library to repo. The plan is to use this library to support projects where a static library uses Lytics but the project using that static library would like to use Lytics itself and add constants to the LyticsSettings simply by supplying its own settings plist file.
added method to LyticsSettings class to allow settings from the LyticsSettings.plist file to be merged into the settings that were initially loaded by a static library. Fixed some bugs with the Merge code added to the repo last commit.