ee_lib_swap.sh should be refined

1. It should be modified to be use the proper approach (dphys-swapfile) to interface with the OS :
   http://manpages.ubuntu.com/manpages/trusty/en/man8/dphys-swapfile.8.html
2. It should check the existing swap file size, not just look how much RAM system has.

rippler@raspberrypi:~$ cat /etc/dphys-swapfile | awk -F"=" '{print $2}'
1024

I have 496 MB of RAM and a 1 GB swap file and the installer still ran my system into the ground (because it lives on a 8GB SD card and I had only 500 MB of free disk space).

 $ free
             total       used       free     shared    buffers     cached
Mem:        496632     485232      11400          0       1912     223708
-/+ buffers/cache:     259612     237020
Swap:      1048572      13812    1034760

[gau1991]

@Rippler ,
dphys-swapfile looks nice alterntive for swap creation/setup. Thanks for this we will look into it :)

[gau1991]

Releated #341