Update Table of Contents

1. complete ch07's link.
2. ch08 should belong Part II.
Merge pull request #75 from Queequeg92/master

add exercise 17.17
Merge pull request #77 from Queequeg92/master

A comment about the erase-remove idiom.
Merge pull request #78 from Queequeg92/master

exercise 17.19.20
Merge pull request #79 from Queequeg92/master

exercise 8.13.14
Merge remote-tracking branch 'upstream/master'
added 8.1~8.3
split the ex8_4_5.cpp to ex8_04.cpp and ex8_05.cpp

1. use the book.txt of data folder
2. added ex8_06
added ex8.7~8.8
:wine_glass: Finished ch8

1. ex8_02 should print, fixed.
2. added ex8_09 ex8_11 and ex8_13 cpp file.
3. move data file to `data` folder.
4. simplify @Mooophy's codes.
Update README.md

added ch08 readme
Merge pull request #80 from pezy/master

Finished Chapter 8.
Update ex12.26.cpp

when I use" delete[] p;",an error occurred.
Merge pull request #12 from gupenghu/patch-2

Update ex12.26.cpp
Merge pull request #81 from pezy/master

Fixed ex12.26.cpp
fix Unicode  semicolon bug
Replace && with and for readability.
Update ex11_3_4.cpp
Update ex10_1_2.cpp

 read values into a list of strings.
Merge pull request #82 from shbling/patch-6

Update ex11_3_4.cpp :std::tolower  to  tolowe