add finsh chapter

TODO:
more introduction about the internal of finsh
delete some characters
fix figure name error in 11-finsh.md
fix some format errors in 11-finsh.md

NOTE: table must begin/end with space lines
fix some spell errors
fix spell errors
add Scons
Merge branch 'master' of github.com:prife/manual-doc
fix spell errors
add more in 10-scons.md
change '\' to '/' 10-scons.md
fix spell errors
fix .py to .python
Merge pull request #23 from prife/master

Add more content