xblock-fields: Revert "Enforce type of the XBlocks Fields when set"

This reverts commit e08b98981e8b360f891f74cc5b17671e6ba9264c.
Enforce type of the XBlocks Fields when set

This updates the XBlock dependency to edX/XBlock@***
and add the newly introduced enforce_type methods
Add xmodule fields enforce_type tests
xblock-fields: Update hash of XBlock repository
mattdrayer/api-modulesgroups: API - Added grouping capability for courseware content
Merge pull request #42 from edx-solutions/mattdrayer/api-modulesgroups

Mattdrayer/api modulesgroups
cdodge/fix-updates-parsing: seems like studio now uses a different HTML formatting, e.g. sections & articles rather than ol & li

make backwards compatible to read older versions of Studio produced updates

add some tests
Merge pull request #46 from edx-solutions/cdodge/fix-updates-parsing

Cdodge/fix updates parsing
mattdrayer/api-modulesgroups: API - Added grouping capability for courseware content
initial commit
add tests