Implemented UUIDField;
Changed backwards, forwards and inverse fields on BudgetTemplateNodeModel to UUIDFields
Added related_name to Sheet.entity
Fixed data processing of graph;
Changed the opacity setting in the spreadsheets with appear/disappear calls
Started implementing Nodes and Items collections
Started implementing items filtering in the browser
Y and Time axes setting
Merge branch 'develop' of https://github.com/prjts/open-budget into develop
Added a shim directive for zepto touch module to depend on zepto - should fix the deps. issue
Merge branch 'develop' of https://github.com/prjts/open-budget into develop