Fixes: #177 - Untuk Sorting Surat agar bisa sorting berdasarkan unread surat
Fixes: #78 - Notifikasi Surat tidak hilang walau surat yang bersangkutan sudah di eksekusi

The url stored in the notification db is /letter/check/:id
Changes version to 4.0-beta
Change year at footer to 2014
Change version at static pages
Merge pull request #30 from dotovr/newVersion

New version
Fix version
Merge pull request #31 from dotovr/reVersion

Fix version
commenting for debug
remove console.log for debug
remove unused files
Change text to indonesia
Added .log to .gitignore
Added .log to .gitignore
revisi fixes#23
revisi lagi
revisi lagi fix23
revisi indent
Fix tipo
perbaikan lagi