Started work in SQL-based RecordStore

Signed-off-by: Matthias Stevens <matthias.stevens@gmail.com>
Merge remote-tracking branch 'remotes/origin/SQLstorage' into lib2x+

Conflicts:
	Library/src/uk/ac/ucl/excites/sapelli/storage/model/Schema.java

Signed-off-by: Matthias Stevens <matthias.stevens@gmail.com>
Bugfixes in storage & transmission

Signed-off-by: Matthias Stevens <matthias.stevens@gmail.com>