Prototype MtApi

Functions:
getCategoryList(blogid, username, password)
getPostCategories(postid, username, password)
getRecentPostTitles(blogid, username, password, numberOfPosts)
getTrackbackPings()
publishPost(postid, username, password)
setPostCategories(postid, username, password, categories)
supportedMethods()
supportedTextFilters()