Highlight extra sections and macros

Highlight sections: %package, %check
Highlight macros: %defattr, %attr, %doc, %ghost, %verify, %docdir, %dir, %configure
Highlight macros with question mark prefix %{?foo}

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>
Update documentation

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>
Merge pull request #1 from ruda/master

Highlight extra sections and macros