Fixed some strange Gradle errors
addAll() method instead of foreach with add()
Added ViewHolder to Adapter Class
Replaced "dp" to "sp" for textSize
Increased textSize to 30sp
extracted all interactions with SharedPreferences into SharedPreferencesHelper
removed unnecessary imports
Extracted getting sharedpreferences to it's own method
replaced Thread on AsyncTask
Merge pull request #10 from MyDogTom/fix-review-remarks

Fix review remarks