Closes #64, I think. Hard to tell, can't repro the issue.

example rack app configuration

relative path to x.png

Fish up 0.2.9

Avoid 404s when the dashboard isn't served on /

New "dial" view, similar to "gauge"

gauge: microfix to html

Displays a vector-based gauge on an HTML <canvas> element.

Canvas elements don't accept relative widths and heights, so each time
the view is resized, we have to recalculate the absolute size in pixels
and update the canvas' properties.

When the gauge's upper limit isn't defined by the user, it is updated to
the biggest value encountered. To make this behaviour understandable, I
made the decision to always display this maximum value alongside the
current one.

gauges.js has bunch of options (colors, animation speed, etc) which I
left to the default values. This can be easily polished up later on if
we feel the need to.

No changes except for renaming Gauge to Dial, works as the original
gauge view.

Grabbed from http://bernii.github.io/gauge.js/
MIT licence.

Add default values for LogView event objects

If any of the required keys are not present in the event object,
underscore's template rendering function will throw an exception.

Closes #70

Add pageup to popup help

Several small details

Rationale: installing thin/puma needs a working toolchain and various
libraries installed. Failing that, "gem install" will abort with an
error which doesn't give much hints to people not familiar with ruby.
Webrick is much slower, but it's pure ruby and doesn't depend on any
other gem. Sinatra will pick up what is available, in this order of
preference: thin, puma, mongrel, webrick.

This frequently confuses first time users.

Load fog only if needed, and emit a helpful message if it's missing.

This removes a ton of dependencies, which makes the default installation
easier for newcomers.

clicked.

Had to kill the caching code; it's been the source of no end of bugs in
the grid for the last six months and I'm just not smart enough to fix
it. Every call goes through (slurred) render now. :(