Added feedback notification

src/main/AndroidManifest.xml

...ificationFramework/notification/FeedbackNotification.java

.../notificationFramework/notification/GoalNotification.java

...otificationFramework/sedentary/frontEnd/DataAnalysis.java

...om/notificationFramework/sedentary/frontEnd/SaveFile.java

.../com/notificationFramework/stimulus/FeedbackStimulus.java

...com/notificationFramework/stimulus/SedentaryStimulus.java

...notificationFramework/stimulusStrategy/Accelerometer.java

...tificationFramework/stimulusStrategy/SigMotionDetect.java

src/main/res/values/strings.xml