typo correction: differnet-to-different
fixed asciidoc syntax
Merge pull request #80 from gAmUssA/master

optimized build
update callouts in xml to use <!--n--> syntax
fix list item index in ch14
Merge pull request #82 from mojavelinux/xml-callouts-syntax

XML-friendly callouts, remove numbers from ordered list in ch14
Merge pull request #67 from orlov0562/master

typo correction: differnet-to-different
Merge pull request #72 from azu/fix_asciidoc_syntax

fixed asciidoc syntax
fix book link