Enhancing caw to show memory information like this : 'Mem-50%'
Changes include -
1. Add a new module memory.py and a new class Memory inside memory.py
2. Update the memory information from /proc/meminfo - every second and show
3. Changes in config file to show the memory widget
Adding prefix 'CPU' for consistency
Merge pull request #2 from arovit/master

Enhancing caw to show memory information like this : 'Mem-50%'