[#777] Refactor to handle core template changes

[#469] Moved Modernizr.js in here. Only used in this repo.

[601] Make sure only active datasets are shown in popular datasets on publisher homepage

[385] Use page_heading helper function consistently

[423] Handle many more graphing edge-cases.

Prepare graphs for an expected time period (since July 2012) rather than for the time period found in the DB, which can be reduced to absurdity with certain queries. Graphs always have a consistent X-axis, ugly logic to combine disparate data series can be removed.

On 'Publisher' and 'Dataset' tabs, always graph the *top 20* series regardless of the month currently rendered in the table. This makes more sense from a useability POV.

Finally, some client side error checking was improved.

Merge branch 'stable' of github.com:datagovuk/ckanext-ga-report

[403] Fix rickshaw choking if there is an empty 'Others' series.

[403] Rickshaw graph always renders all series, no matter which month is selected.

[403] Fix rickshaw choking if there is an empty 'Others' series.

[403] Rickshaw graph always renders all series, no matter which month is selected.

[304] most_popular_datasets can render a preview image

[304] Don't show No Graph Loaded text on Publishers page.

[304] No need to declare a content_class any longer.

[304] Restyled sidebar

[304] Remove minornavigation elements from ga-report extension.

[noticket] Hide momentary flash of text on sparkline cells.

[329] Rebase hashchange tab code on core plugin developed for ticket 329.

[321] Added month selector. Colorising graphs in Safari and IE.

[321] Redraw sparklines on tab refresh

Merge branch 'master' of github.com:datagovuk/ckanext-ga-report

[162] Force browers to refresh JS and CSS with revamp.

[162] Subtle hinting that graph legends can be toggled.

[162] Assertions were overzealous. Code can handle more broken data now.

[273] Change alignment of numeric values in tables.

[172] Maintain current month when navigating around Analytics sections.

[162] Cleaning up IE7 issues.

[162] Rearranging ga_reports graphs per ticket feedback. Series are sensibly ordered. Page is restructured.

#167 Refactoring controller's logic to create better Percentage graphs

#167 Togglable graph legend. Disabled mouseover.

#167 Reverted modifications to libraries. Wrote rickshaw_ie7_shim.js to get libs loading without errors on IE7.

#167 Patching to make render error-free in IE7. Modernizr is used to disable libraries.

#167 Fixing for /dataset and /publishers

#167 JS development of hashchange-dependant tabbing mechanism, and of Rickshaw graphs with separate legends.

A fix for the copy and paste error that accounts for #211

Merge branch 'master' of github.com:datagovuk/ckanext-ga-report

Fixed problem with counting current position

[xs] #219 Improved punctuation.

Makes sure we don't add (and log) when we can't find the dataset for popular, fixes #242

Adds info on 'No data' to fix #219

Merge commit 'd0db210'

Improved debug logging.

When downloading this month, and specifying this month (rather than "latest"), note that it only goes up to today (instead of the end of the month).

#167 Render percentages on the site_usage graphs

#167 Render legends correctly.

#167 Refactoring