Do not keep config/database.yml in version control

Users might use different database settings (for example use MySQL
instead of sqlite3 for local development), so don't manage the config
file in version control.
Make sure CI has a database config file
set dashboard name on embed show
Merge pull request #132 from prometheus/generate-link-on-embed-page

Set dashboard name on embed page
Format page title

This change adds support to set custom page titles and adds meaningful
titles for dashboard and server main views.

    ApplicationHelper
      #page_title
        given no input
          returns a default title
          includes a set content variable title
        given a string
          returns the given value
          sets the title content variable
        given any other input
          raises an ArgumentError
Merge pull request #134 from prometheus/page-title

Format page title
Upgrade d3js
Add support for logarithmic scale and multiple axes.
Merge pull request #111 from prometheus/multi-axis-support

Multi-Axis support
Single widget pages link to their dashboard
Merge pull request #133 from prometheus/dashboard-link-from-widget

Link to dashboard from widget
Add support for dashboard cloning
Merge pull request #129 from prometheus/dolly

Clone dashboard
Add support for copying individual graphs.