addElementWithElementData method name change to createElementWithElement Data.
fix "wrong method calling"(sort album).
fix getBlogCategoriesWithUserName bugs
PIXBlogTests.m added.
bug fixed.
bug fixed.
before remove PiXSiteBlogCategory enum commit.
PIXSiteBlogCategories enum removed.
sort categories tested and fixed.
remove strange completions.
create blog article tested.
create blog article methods updated and tested.
methods name layout updated.
implement empty method