Add "Zoomable" sample

Adds a chart using the App Store "number of new apps per month" data,
and enables zooming and panning on it.
Add Correlation demo

Uses the app store sample, with interchangeable axes to display
correlation with different data combinations. Displays both the visual
and numerical result.
Merge pull request #125 from tpkelly/gh-pages-dev

Add "Zoomable" sample
Merge pull request #124 from niksoper/gh-pages-dev

Chart examples with theme support
Merge 'upstream' into gh-pages-dev

Conflicts:
	InsightJS/dist/insight.min.js
	insight.js.zip
Tweaks to correlation

- Moves correlation coefficient to above the chart
- Adds a "selected" class to the last clicked button in the x and y
  categories, and styles it with css.
- References the ErrorContainer class instead of variable name
Reposition "Correlation Coefficient" div

Moved the div above the chart, displaying the correlation coefficient
over the data.
Add wiki link

Adds a link to the pearson coefficient, and rephrases to talk about
variable relationships instead of trends.
Merge pull request #128 from tpkelly/gh-pages-dev

Add Correlation demo
Merge remote-tracking branch 'upstream/gh-pages-dev' into niksoper-gh-pages-dev

Conflicts:
	pages.json