Added a script to install demo data for the install guide
Set the -u flag so undefined variabled are counted as errors
Moved the hva node id setup and machine image downloading before the database setup
Commented and indented the *-manage commands
Removed the RUN=yes variable
Fixed a typo in a comment line
Fixed a mistake in the comment removing regex
Don't put rake in the PATH. Call it with an absolute path instead.
Split up the database comments to make more sense
Added a link to the install guide
Merge pull request #462 from axsh/install-demo-data-script

demo data install script (ci skip)