Fixed default value for LINUX_SUNXI_BUILD_SKIP,  LINUX_SUNXI_CONFIG_SKIP, ROOTFS_FILE_COMPRESSED and  KERNEL_OUTPUT_MODULES_VERSION_DIR.
Fixed KERNEL_OUTPUT_MODULES_VERSION_DIR directory detection for kernel version appending additional info to major.minor.patches string
Fixed default value for OUTPUT_DIR
Used patwooh's linux sunxi as default kernel source