[sprint] make sprint 5 progress report and sprint 6 backlog

[hadooboo]

like issue #56

[tho-kn]

finished googleMap and related test cases.
finished rewriting post/edit review to use dispatch for axios usage
added corresponding reducer actions, dispatch
ReviewLocation in progress

todo:
complete ReviewLocation
fix history.push timing (will write issue on this)
googlemap improvement, get restaurant id / filter restaurant / choose among marker
other googlemap related codes in frontend, when it is needed

[ByungHeeCha]

finished tagging and updating user and menu model.
improved design of main page
improved design of uploading review->deleted upload page. made a modal for uploading review

todo:
make more user friendly design of main page.
make recommendation page.

[jyeok]

finished
rendering of user view (signup and login)
testing of user view (signup and login)
enhanced features for user's convenience (duplicated check, error message rendering)
syncing with dev branch (bunch of conflict occured)

todo
main page ui enhancement
friend feature add
help recommendation view ui page