Initial commit - v1.2.4

Taken from http://opensource.samsung.com/ :: exfat_1.2.4.zip
Add comments based on ones in Android version 1.1.5
Kernel 3.10 compatibility
kuid_t/kgid_t was introduced in 3.5
fix kernel null dereference when accessing a fat16/fat32 disk
fix name_hash calculation on big-endian cpu
ignore name_hash comparation (because Windows ignores it too)
use kernel macro to detect endian
codepage is not meaningful in exfat
fixing CONFIG_UIDGID_STRICT_TYPE_CHECKS compatibility issue
merge the two modules into one
Add debian packaging