added isleaf docs
added isleaf docs

kongx73/angular-tree-control,looker/angular-tree-control,steveyee/test,tehwalris/angular-tree-control,nikolay-lesko/angular-tree-control,alinnert/angular-tree-control,JECR9421/angular-tree-control,tehwalris/angular-tree-control,LSEducation/angular-tree-control,JECR9421/angular-tree-control,alinnert/angular-tree-control,LSEducation/angular-tree-control,kongx73/angular-tree-control,alexanderpa/angular-tree-control,IanShoe/angular-tree-control,domakas/angular-tree-control,yanivefraim/angular-tree-control,anreinha/angular-tree-control,domakas/angular-tree-control,lewis-ing/angular-tree-control,alexanderpa/angular-tree-control,nikolay-lesko/angular-tree-control,kzganesan/angular-tree-control,anreinha/angular-tree-control,yanivefraim/angular-tree-control,wix/angular-tree-control,looker/angular-tree-control,lewis-ing/angular-tree-control,steveyee/test,kzganesan/angular-tree-control,wix/angular-tree-control,IanShoe/angular-tree-control