Restored vibration option
Merge pull request #7 from Neamar/vibration

Restored vibration option
Removed gradlew files
Added gradle (looks like good practice)
Removed notificationId hashMap
Using SQLite to store messages
Cleaning database, returning previous date
Unused import
Merge pull request #8 from Neamar/sqlite3

To Sqlite3
Add notify type preference.
Differentiate highlights and mentions.