panoptes: 2.0.alpha7

Seventh alpha release of the Panoptes 2.0 series. This release introduces pivot tables - a way of summarising data tables. Work on maps and genotypes are progressing well but are not ready to merge till next release. Breaking changes: Queries are no longer base64 encoded except on the wire - allowing them to be edited in config and specified in templates. This release includes: Features: #456 - Prototype Pivot table #379 - Warn if screen too small #464 - Only encode queries on the wire #438 - Key handling in Query Picker #462 - Auto set API endpoint #471 - Allow remote development Fixes: #402 - Pie charts are now shown when all data is NULL #444 - Close the correct criteria in query picker #391 - Warn the user if they try to download unfeasibly large dat