[PATCHES] Serious TnyFolderStore api change and new functionality

[Rob Taylor <rob taylor codethink co uk>]

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Attached are a bunch of patches that add three major pieces of API:

1) adds a 'refresh' parameter to tny_camel_folder_store_get_folders to 
allow getting the folders as they are currently cached without 
refreshing from the server
2) adds tny_camel_folder_store_refresh_async to cause a refresh from the 
server
3) adds 'appeared' folders to TnyCamelFolderStoreChange. A folder store 
observer will get the currently existing folders as an 'appeared' change 
when the cache is first refreshed or when the observer is first attached 
to a folderstore.

A good review would be appreciated as it is a large change!

Also attached is a small change that uses dispose for unreffing object 
for TnyCamelFolder and TnyCamelStoreAccount, rather than unreffing in 
finalize, which is bad gobject style and can result in unbreakable 
ref-count loops.

Thanks,
Rob