Fix a bug in IntMap.clear() (issue #144)

git-svn-id: http://kryo.googlecode.com/svn/trunk@422 a9660ef0-a895-11de-8ba5-91705c1537ed
The total() method should return long instead of int (fixes issue #142)

git-svn-id: http://kryo.googlecode.com/svn/trunk@423 a9660ef0-a895-11de-8ba5-91705c1537ed