In plugins we should never add hooks conditionally; the condition should
remain within individual hooks, so the plugin can be toggled at any
time.

Ideally we should also 'inline' the hook functions, since they're used
nowhere else.  But since that would involve a lot of code changes, we'll
put it off until the broader cleanup effort scheduled for 0.9.0.

After shrinking the global example placeholder size, ones with
additional content within the demo area needed to be tweaked
individually, to prevent the other content from wrapping down or
extending off the side of the container.

The smaller size ensures that the example plots remain fully visible on
more of our most common visitor screen resolutions.

We don't want users to think the example is broken when they first load
it.

The location of the file changed during the recent example revamp.

This prevents the Chicago example from showing up blank.  The
alternative is to define a callback, but that's messier.

This allows a page to have multiple placeholders, since we're no longer
tied to unique IDs.

Fix incorrect display of NaN with the default tickFormatter.

Change-Id: If53fdb1bf9563834c58cf2b569d0e1a6a7155eb8

Revamped the built-in examples.

Give any direct child of demo-containre the same style, so it can be
used for both #placeholder and #overview.

Added explicit border-spacing to compensate for global removal of
padding.  Flot should really take care of this itself; layout-critical
styles shouldn't depend on the user-agent defaults.

Slightly widened the page to account for the fact that most people have
widescreen monitors these days.  Also made text larger and more legible,
and created a nice 'clipping' effect for the placeholder.

flot.threshold: insert generated series after original, not in the end

To improve organization with the increasing number of examples, every
example page is now the index of its own subdirectory, which contains
all the files specific to that example.

Thus, prevent it from becoming topmost (it may cause strange looks if
original series is not topmost: some part of it becomes topmost and
overwrites some lines and points that should be above it instead).

Fix an error in plot offset calculation.

Correction calculation error margin 

Ensure that tickSize updates on subsequent calls to setupGrid.

Fixed jQuery version dependency (we require 1.2.6, not 1.3.2) and
whitespace.

Flot's semver is 0.8.0-alpha, and it (for now) requires jQuery 1.2.6,
not 1.3.2.

Adding component.json for bower.

Added a series 'zero' option to control automatic scaling.