fixed typo for libxslt

Signed-off-by: Ruben Smits <ruben@intermodalics.eu>
Try to fix newline insertion
add support for package specific post build steps

Signed-off-by: Ruben Smits <ruben@intermodalics.eu>
updated .gitignore

Signed-off-by: Ruben Smits <ruben@intermodalics.eu>
add parsing of version and package revision

Signed-off-by: Ruben Smits <ruben@intermodalics.eu>
add checksum calculation

Signed-off-by: Ruben Smits <ruben@intermodalics.eu>