Add method to range to map coarser subrange to iterable of subranges in finer gran
Add test to SlotTest to test the new Range method
Add parameter descritpions
Fix the method description
Log start and stop time ranges for IllegalArgumentException and remove unrequired casting from the SlotTest
Fix some nits
Remove unused import
Merge pull request #212 from chinmay-gupte/add_method_to_map_coarserRange_to_finerSubranges

Add method to map coarser range to finer subranges