Linux 3.x has only two version numbers, not three

Linux 3.x has no patch level anymore, thus only check if two digits
could be read from uname.
Adapt ```/proc/meminfo``` output to Linux 3.14

Linux 3.14 introduces an additional line in the /proc/meminfo ouput.
This needs to be considered when calculating the amount of free memory.
Merge branch 'linux_3.x'