fix #91

missing return statement
#91 thanks to Jimmy liang
fix typo

fist=>first
Merge branch 'feature-fixSet' into develop
Hakan !
Merge branch 'feature-hakan' into develop
Fix bug related to restoring the last solution in case of #findAllSolutions()
Merge branch 'fix-br2fa' into develop
allow negative sets

to be continued
fix sets

should be ok now
TODO : shorter method names?
shorter method names
fix for issue #94

SetVar now handle negative integers
Merge branch 'feature-negset' into develop
Fixed int channeling.