merged the content type extension and delta

.gitignore

CMakeLists.txt

README

README.txt

cmake/Modules/FindGettextLib.cmake

cmake/Modules/FindJthread.cmake

cmake/Modules/FindSqlite3.cmake

data/book.png

data/bookshelf.png

data/brick.png

data/cactus_side.png

data/cactus_top.png

data/clay.png

data/clay_brick.png

data/fence.png

data/firefly.png

data/lump_of_clay.png

data/paper.png

data/papyrus.png

data/rail.png