Merge pull request #68 from chdemko/master

Add a code coverage rule
DoublingConvex

+ add doublingConvex method in latticeFactory
+ add corresponding test & modify iuml file

* modify two failling tests in conceptlatticetest
* update changelog
Correct compatibility with Java6
Test 2 : Java6 compatibility problem
Merge pull request #69 from JeanFrancoisViaud/master

DoublingConvex
Check style