Merge pull request #4 from woonketwong/master

Implement login path
Implement login path
Implement passport feature
Can successfully login
Merge pull request #5 from woonketwong/authentication

Authentication
progress with worker application
User preferences inserted into database
fix package.json
Added material to application
Added employer registration form
More work on user app
Misc
Implement employer signup paths and refactor email notification code
Merge pull request #6 from woonketwong/employerSignUp

Implement employer signup paths and refactor email notification code
Work on employer login
fixed bad form route
Fixed isValidUserPassword typo