More database and .apk added

assets/databases/ocw.zip: Added speaker ids column.

ocw-android.apk: installable apk for testing.

src/org/osuosl/ocw/DataBaseHandler.java: Methods to handle speaker ids.

src/org/osuosl/ocw/Event.java: Methods to handles speaker ids.

src/org/osuosl/ocw/Schedule.java: Retrieve speakers from database when no internet.