Fixed wrong whitespaces

Microsoft Word randomly included weird whitespaces. The hexcode
for the regular whitespace is '20'. These wrong whitespaces are
in fact two characters with codes 'C2 A0'. Depending on your
editor, you'll see an error or a regular whitespace.
Close multiline comment
Replaced `php.net` links with non localized ones
Add missing code markdown
Minor formating fix
Merge branch 'pull-request/25'
Merge branch 'pull-request/9'

Conflicts:
	spec/php-spec-draft.md
typo fixes from pull #23
Add chapters