DatabaseHandler and Class changes
UUID en INSERTS y UPDATES, UUID de prueba
Updates e Inserts con UUID solo falta CheckHomework
Import students
CheckStudent
Merge pull request #2 from NivxB/DBChanges

Db changes
Merge pull request #3 from DaemonAeon/master

Login Facebook
Merge pull request #1 from NivxB/BugFix

Close CURSORS DB
Merge pull request #2 from NivxB/DBChanges

Db changes
HistoricDialog
Historic falta Deshabilitar opciones cuando se ve una clase anterior
Viendo historico botones se dehabilitan.
Merge pull request #4 from NivxB/Historic

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fix4