Aside import/export
PLAT-220
Merge pull request #279 from edx/dhm/aside_export

Aside import/export
Create method for runtimes to override
for deciding which types of asides to use for given blocks
Merge pull request #282 from edx/dhm/aside_filter

Create method for runtimes to override
change XBlockUser to 2-tier attributes
Merge pull request #280 from edx/jbau/user-service

change XBlockUser to 2-tier attributes
fix for silly bug on test_assert for user_service
Merge pull request #283 from edx/jbau/user-service

fix for silly bug on test_assert for user_service
Pass the block family name with KeyValueStore keys
Minor cleanup of get_asides
Make overriding of _field_data still work
Add documentation to ScopeIds
Add a css class that includes the view being rendered to the XBlock-family wrapping div
Merge pull request #281 from cpennington/asides-in-platform

Functionality needed for XBlockAsides in edx-platform
index_view exposable in XBlocks