try to add db feature.
add order link.
add missed comma.
bugfix: modify path where .pgpass exists.
modify vesion number.
ignore node_modules
remove node_modules.
code for serveing static files.
bugfix: path error when being to read .pgpass file.
add a new ORM definition for experiment.
add signup/login feature.
implement user signup funciton.
bugfix: typo.
modify layout of signup form block.
modify layout so that form block also is included in the main container div.
improve styles of signup form.
relocate signup form so that it stands at head.
improve style of the sign up form so that the wrapped part of the form stays in center when being displayed in a small screen.
improve style of buttons by adopting class from bootstrap.
improve layout of the sign up form so that the wrapped part of it keeps space between the part above.