Throw error when flot.time plugin is missing.

- The faster toFixed alternative now returns a string, as tickFormatter
is expected to do

We changed the === to == and removed the typeof operator.  We also changed the tabs to spaces.

Switched to a much a faster default tickFormatter.

Fixes issues 709 on google code.

- toFixed() is sloooow
http://jsperf.com/tofixed-vs-factor

Better date/time formatting

Fix minTickSize for year units

Timezone support, time mode pluginification

time zones.

Added a 'right' option for bar alignment.

Convert README to markdown format

Prevent single slice pie charts on example page

Throw IE- and Safari-friendly error upon finding invalid dimensions.