Create FixedSizeQueue interface
Create LinkedFixedSizeQueue class
Add method isFull to FixedSizeQueue
Removed optionality of add in FixedSizeQueue
Document FixedSizeQueue
Rename FixedSizeQueue to FixedCapacityQueue (implementation renamed accordingly)
Document LinkedFixedSizeQueue
Merge branch 'wip/fsq' into dev
Update documentation of FixedCapacityQueue and LinkedFixedCapacityQueue to support unmodifiable subclasses
Add UnmodifiableFixedCapacityQueue to CollectionsIg
Add empty, singleton and unmodifiable FixedCapacityQueue to CollectionsIg
Merge branch 'wip/CollectionsIg' into dev