Update README.md
Merge pull request #1 from newton10471/master

fixes rspec config and requires proper date format for new donor creation
config rspec to reset mongodb each time
Merge pull request #6 from xiaoboa/master

config rspec to reset mongodb each time
Merge pull request #7 from newton10471/master

add data model diagram
Merge pull request #8 from newton10471/master

updates from second pairing session
Merge pull request #12 from newton10471/master

commits from pairing session #3
add date picker for blood drive form