Merge pull request #113 from JeanFrancoisViaud/master

Add everything needed to use FIMI .dat files
Merge pull request #114 from JeanFrancoisViaud/master

Merging for the moment. May be, we need to refactor the library to use iterators.
Readding comments
Correcting error
Remove tokenizer for Node.toString
Simplify copy method
Removing some warnings when compile with -Xlint
Readding comments
Readding comments
Changing copyright
Simplify code
Add unit tests
Remove useless parenthesis
Use static fields
Use static fields
Add -Xlint for tests
Change methods to private
Change methods to private
Use clone method and Cloneable interface instead of copy method
Add methods