Removed unprintable characters:

Removed unprintable unicode characters at the beginning of some Latex files
that were causing build errors in Linux.
Removed unprintable characters:

Removed unprintable unicode characters at the beginning of some Latex files
that were causing build errors in Linux.
Merge branch 'master' of https://github.com/yujokang/RE-for-beginners
Undo some "sanitization":

Add back some commenting symbols that came before the first Latex function
in some files, and were accidentally removed.
Proofread English version of chapter 5:

Proofread Chapter 5 for English language.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	patterns/03_printf/x86.tex
Merge pull request #25 from yujokang/master

Edits to Chapter 5, and removed some unprintable characters.