Fixed valgrind lecture
Added examples for valgrind
- Changed tilde, not excellent, but better.
- Added epoch.
- Some other changes...
Additional fixes.
Refactored slides, mostly based on http://fedoraproject.org/wiki/How_to_create_an_RPM_package
some fix of profiling, perf is added
Merge pull request #2 from KostyaSha/master

changes...
Moved to homework
New separate course Linux Essentials
doxigen some fixes
Second lecture for linux essentials
Added intro lecture for LinuxEssentials
Added Unix principles.

From book "The Art of Unix Programming"
Added TOC at (sub)sections beginning
Added new slide to shell-intro
Fix a merge conflict in one of the Makefiles
Lecture 3
Fixes and additions for command line
Lecture 04 Linux essentials
Minor fixes