Simplify App store charts

Removes the "Advisory rating" chart, and the line chart of apps over
time. Squashes all other charts onto a single line, so they are all
on screen on initial load.
Reverted change to crossfilter.min.js after a filtering bug was discovered

Clicking 'DE' followed by 'ES' on the language chart caused the genre bars to disappear.
This bug doesn't occur when using the full crossfilter source.
Using crossfilter 1.3.7 minified.
Merge pull request #182 from matthewdunsdon/gh-pages-dev

Remove manual margins from examples on website
Fixed reference to crossfilter.1-3-7.min.js
Merge pull request #180 from niksoper/gh-pages-dev

Reverted crossfilter.min.js to version 1.3.7
Merge 'upstream' into gh-pages-dev

Conflicts:
	js/controllers/indexController.js
	js/insightChartsControllers.js
Tidy up front-page examples

Adds titles to each chart, and formats the App price to use currency
tick format.

Imports the fix to allow axis line width/color to be changed.
Import title fix

Brings in the fix for title styling, and title padding.
Merge pull request #181 from tpkelly/gh-pages-dev

Simplify App store charts
Imported insight library including manual filtering.
Styled links to show interesting filtering.
Added filtering examples
Moved button to clear filters
Updated filter example links
Allowing filtering to be reset after a chart has been clicked

Imported the updated library including ChartGroup.filterChanged.
Allowing more than one genre or language to be programatically filtered at once.
Using the escape key to clear filters
Styled button for clearing filters
Fixed exceptions caused by angular $apply within $apply

The ChartGroup.filterChanged event is called either as part of clicking
on the chart or the the hyperlink, the latter uses Angular bindings.

In order for Angular to detect that the scope has changed, $apply must
be called. However you can not call $apply from an Angular bound event,
so a conditional check needed to be introduced before calling $apply.
Removed unnecessary margin from all divs within #container-body