[PLINK-130] - Implementing File store.
[PLINK-130] - Merging latest changes. Fixing compilation and checkstyle errors.
[PLINK-130] - Changing Configuration API to support multiple configurations.
[PLINK-130] - Initial code for the File store.
[PLINK-130] - Initial code for the File store.
[PLINK-130] - Initial code for the File store.
[PLINK-130] - Fixing compilation errors.
[PLINK-130] - Fixing compilation errors.