It is best to use  and  in 10.1
added 10.5
Merge remote-tracking branch 'Mooophy/master'
added 10.6 to 10.10

1. added 10.7 and 10.8
2. splited 10.6 from ex10_6_9_10.cpp
3. splited 10.10 from ex10_6_9_10.cpp
4. added clang different result noting in comments.
added 10.11 ~ 10.13 to README

1. refactor 10.11 casue stable_sort should be used after elimdups
2. edit 10.12 that using the class Sales_data of ch07
3. edit 10.13's function name. "longer" better than "bigger"
added 10.14 ~ 10.19 to README

1. added 10.17
2. move 10.14 and 10.15 to README from ex10_14_15_16.cpp
3. rename 10.20.21
refactor 10.18~19, we don't need stable_sort if we don't use find_if.
refactor 10.21
added 10.22 ~ 10.25 to README

1. added 10.22
2. move 10.23 from ex10_20_21_22_23.cpp
3. use const (10.24)
4. refactor 10.25
fixed links
added 10.26 ~ 28 to README.md and simplify 10.2728
added 10.29 ~ 33 to README.md

1. split off 29 30 31 from ex10_29_30_31.cpp
2. added 32
3. simplify 10.33
added fstream close
don't need close the fstream
added 10.34 ~ 37 to README.md
Finished Chapter 10

refactor 10.42
Merge pull request #96 from pezy/master

Finished Chapter 10.