Clean build scripts
Fixed #197: Adding MCMessageRenderingOperation.h to public headers
CMakefile: Detection of UUID, tidy and libxml2
Fixed #8: When the attachment is a folder, the folder is compressed and the attachment is the compressed file.
Fixed build
Fixed build of iOS example
Fixed MCOIMAPSession
Don't crash when namespace is empty
Fixed build
Merge remote-tracking branch 'upstream/master'