DatabaseService updated, added sqlite library
-added sqlite-jdbc library to classpath

DatabaseService.java:
-removed all calls to System.exit()
-changed System.err.println to Log.e
-fixed bug where checking for previously stored data when no data had been stored would trigger a null pointer exception
-changed all package private methods to public
-changed returns in readTextData() and readBinData() to return null instead of error string

Coordinator.java:
-added calls to DatabaseService
-changed return of readBinData() to byte[] from Byte[]