Angular refactor

This isn't a complete refactor, but it is a start. Addresses #223.

Changes:
* Overrides Flask's template tags (`{{ }}` becomes `<% %>`), since Angular's are the ones that are used 99% of the time.
* Some organizational improvements in the directory structure.
* Flattens querybuilder by using scope inheritance rather than isolate scopes.
* Adds `ng-model` support for all VQB input types (like `<cpf>`).
ahh i see. It doesn't need schema because it can just access $scope.schemas? Would doing schemas=schemas before have worked instead of schema="$parent.schemas[$parent.index]? The problem there was that the inherited scope wouldn't update the variable on the parent scope right?