Merge pull request #459 from edx-solutions/group_project_v2

Update hash: Added Group Project V2 to list of required XBlocks

requirements/edx/custom.txt

 # Custom requirements to be customized by individual OpenEdX instances
 
--e git+https://github.com/edx/xblock-utils.git@a0e77eeb4eb971ac57243fe1056dd8db6806f514#egg=xblock-utils
+-e git+https://github.com/edx/xblock-utils.git@25f15734ec8d29fde0e114bbd199fd48638865ae#egg=xblock-utils
 -e git+https://github.com/edx-solutions/xblock-mentoring.git@bd0b3f413ae7e8274985555adfd7de7af3eca84c#egg=xblock-mentoring
 -e git+https://github.com/edx-solutions/xblock-image-explorer.git@21b9bcc4f2c7917463ab18a596161ac6c58c9c4a#egg=xblock-image-explorer
 -e git+https://github.com/edx-solutions/xblock-drag-and-drop.git@92ee2055a16899090a073e1df81e35d5293ad767#egg=xblock-drag-and-drop
@@ -12,3 +12,4 @@
 -e git+https://github.com/OfficeDev/xblock-officemix/@86238f5968a08db005717dbddc346808f1ed3716#egg=xblock_officemix-master
 -e git+https://github.com/edx/edx-notifications.git@4e3323da6775a101da5d8beab80c231278df69d2#egg=edx-notifications
 -e git+https://github.com/open-craft/problem-builder.git@f42c7c572c7c9e5155062f3f1874714abf63e92a#egg=problem-builder
+-e git+https://github.com/open-craft/xblock-group-project-v2.git@8bac3127ffd4f83976ea300b6d6c5303d226b06a#egg=xblock-group-project-v2