Added all items from CIS Section 5 Levels 1 & 2
Fixes as requested for PRs

-Fixed typo with section tag
-Added purge to apt removes in this and previous sections
-Updated readme to add warning regarding non-64bit architectures
-Added prelink execution to remove headers if installed
Merge pull request #4 from waveaccounting/ubuntu-support-section5

Added all items from CIS Section 5 Levels 1 & 2