update requirement and design and database doc.
Merge pull request #186 from forumbyr/master

update requirement and design and database doc.
update database doc.
Merge pull request #187 from forumbyr/master

update database doc.
Merge pull request #188 from forumbyr/master

update design doc.
Merge pull request #190 from forumbyr/master

update sql and build file.
Merge pull request #27 from cnnic/dev

Dev