fix: support for kernels other than 2.6.33
mod: build variable git_name_kernel doesn't need to be configured separatly, only depends on the selected kernel version
mod: clone kernel repository from github
mod: use new repository locations on github when building the kernel
fix: remove some commented code
mod: name std_kernel_pkg_name according to selected kernel version
fix: use correct variable for kernel version
changed: kernel repositories now from github
add: tmux and php5-cgi to rootfs build script
add: generate md5 sums of output for gnublin-installer
new: tar.gz kernel and lib/ for gnublin-installer
some bugfixes