Some orthographic correction

Description: orthographic correction

Commit:Ref

TaskNumber:#6
Fixbug #3: User receives notification about workingTime violations on
wrong preference screen

Description: Added a preference key, for each prefereceScreen. It is
used tho identify which screen is been updated.

Commit:Fix

BugNumber:#3
Fixbug #2: TimePicker on BusinessHour Prerence Screen losing its value after
rotation screen

Description:This bug is related on Android Official Forum Bug 5483.
Added the attribute android:onConfigurationChanges=orientation
on SettingsActivity on AndroidManifest.xml.

Commit:Fix

BugNumber:#2