fix type and comment of variadic template sample
Merge pull request #108 from tzik/var_tmp

fix type and comment of variadic template sample
rewrite the example of pack expansion in attribute list.
fix example code comment & clarify that the parameter pack can be empty.
fix variadic template example.
solve: https://github.com/EzoeRyou/cpp-book/pull/110
wrote alignment.
remove some TODOs.
Fixed typos.
wrote class name
wrote token
wrote safely-derived pointers.
Fixed a typo.
wrote allocation function
wrote deallocation function
Merge pull request #111 from hiroshi-manabe/typo-nobe

Fixed typos.
Merge pull request #112 from hiroshi-manabe/typo-toshite

Fixed a typo.
wrote constant expression
Merge branch 'gh-pages' of https://github.com/EzoeRyou/cpp-book into gh-pages
resolve all TODOs save for Copying and moving class objects
monor wording change.