Merge pull request #9 from peterlee0127/develop

Develop
Merge pull request #11 from peterlee0127/develop

update README.md image size
Merge pull request #12 from peterlee0127/develop

Develop
Merge pull request #13 from peterlee0127/develop

Develop
Merge pull request #14 from peterlee0127/develop

fix Socket.IO iOS Library issue
Merge pull request #15 from peterlee0127/develop

update README.md
Merge pull request #16 from peterlee0127/develop

update README.md , and update app.'s mongoose connect
Merge pull request #17 from peterlee0127/develop

fix iOS config redefine
Merge pull request #18 from peterlee0127/develop

Develop
Merge pull request #19 from peterlee0127/develop

update README.md
Merge pull request #20 from peterlee0127/develop

update img
Merge pull request #21 from peterlee0127/develop

fix connect mongo
Merge pull request #22 from peterlee0127/develop

add server image
Merge pull request #23 from peterlee0127/develop

Develop
Merge pull request #24 from peterlee0127/develop

update logger
Merge pull request #25 from peterlee0127/develop

update
Merge pull request #26 from peterlee0127/develop

update README.md
Merge pull request #27 from peterlee0127/develop

fix README.md
Merge pull request #28 from peterlee0127/develop

Develop
Merge pull request #29 from peterlee0127/develop

add chat,show user distance