The time complexity of any isEmpty() method implementation should be
O(1) whereas some implementations of size() can be O(n). Thus, using
this rule provides performance benefits.

The cleanup in this bundle was split into two commits.
jSparrow Cleanup

Change-Id: Idf049f636786d2ff82c6c3b6f4430b52dc9bc11c
Signed-off-by: Ardit Ymeri <ardit.ymeri@splendit.at>