Added documentation for HP Vertica and Redshift
Removed dollar-quoted inserts from examples because they broke the syntax-highlighting, when running via jekyll.
Also fixed a copy-and-paste error in the page menu for Redshift and Vertica in documentation.html.
Added database setup documentation for Vertica a Redshift.
Merge pull request #19 from nathanvick/flyway-3.1

Added documentation for HP Vertica and Redshift