Database work

/src/org/osuosl/ocw/DataBaseHandler.java: Added keys for schedule and speakers tables. Added methods for updating a row of the schedule/speakers table.

/src/org/osuosl/ocw/Event.java: Changed some attribute names. Added constructor, setters and getters.

/src/org/osuosl/ocw/ICal.java: Change Id to int.

/src/org/osuosl/ocw/Schedule.java: Added methods for updating a row of the schedule/speakers table.

/src/org/osuosl/ocw/Speaker.java: Added constructors, getters and setters.