TulpApplication + some code simplification

-> Added TulpApplication class which extends Appliccation, this way we
can have variables and methods available throughout the application’s
life cycle without recreating a class in every activity
-> Added a few methods to TulpApplication for ImageLoader and
DisplayImageOptions so that they are created only once throughout the
application’s life cycle
-> Simplified code in SearchResultActivity.java and
BuildingInstructionActivity.java to use the method in TulpApplication
related to ImagerLoader/DisplayImageOptions
-> Changed Manifest.xml so it uses TulpApplication
Tiny correction in TulpApplication

Removed unnecessary line.