Add reference spending to coverage tab

[dalepotter]

In line with the comments listed on the Coverage page, as well as proposals listed in the Indicator Coverage Methodology - consultation space, the IATI Technical team is now working on collating 2014 & 2015 reference spending from disparate sources:

This collated information will need to be accessible to this repository (suggest add as a csv file) and then pulled into the correct place on the page,

[dalepotter]

The IATI technical team have been considering the best approach to rolling out reference spend data for each publisher to the live dashboard, together with associated logic to calculate a coverage ratio.

Publishers will be contacted in batches of 20, when reference data has been collected for a given publisher, and there will be a link to a development dashboard, where publishers will be able to view the reference spend data that has been collected. Publishers will have the opportunity to comment and correct any erroneous data that has been found against their name.

For publishers were no reference data has yet been found – or the publisher has not yet been contacted – a dash will be added on the coverage table to show data is not available. Where no reference data is available (therefore meaning a coverage ratio cannot be calculated), a default 'coverage score' of 50% will be attributed. An asterisk and subsequence note will also show this. NOTE: This has now been superseded by #392, with publishers with no data now assigned a coverage ratio of 20%.

When all publishers have been contacted, the data will be deployed on the live dashboard.