Updates to Code

Changes to add new content.
Minor cleanup

Stripping extra comments and gunk from a couple of files
Updates for Exercises

Adding ExerciseSearch and ExerciseSensors
Small changes

Just normalizing the HelloBluetooth and HelloNetwork naming
Update to ExerciseDevices

Correcting the master version of ExerciseDevices
Moving HelloNetwork to HelloConnection

Moving and improving the HelloNetwork project
Update to ExerciseTags

Fixes and final code for Exercise.
Merging branch master into complete