Update ngdoc.js

adds isProperty to method @param to support 
@param {Object} param1 Some obj
@param {String} param.name some name on the obj

parameters which are marked as isProperty is not included in the method signature
Merge pull request #22 from perploug/master

feat(ngdocs): @param support for object properties 

@param {Object} param Some obj
@param {String} param.name some name on the obj

Object properties are not included in the method signature