Style changes to Chapter 2 in English:

Tweaked some wording and word order in the
English version of Chapter 2, up to the beginning
of 2.3.
Merge remote-tracking branch 'upstream/master'
Fixed typo about advantage of using EDI in 2.2.2:

In 2.2.2, it should be the 64-bit version that
uses 7 bytes, not the 32-bit version, which we
just saw uses only 5 bytes.
Style changes for 2.3:

Changed some wording and punctuation for
English version of 2.3.
Merge remote-tracking branch 'upstream/master'
Removed an unprintable character:

Removed an unprintable character at the
begining of a file, which was causing
trouble for Latex on Linux.
Merge pull request #18 from yujokang/master

Style and some technical fixes