Add dReg.

.gitmodules

 [submodule "MakeGencodeTSS"]
 	path = MakeGencodeTSS
 	url = https://github.com/sdjebali/MakeGencodeTSS
+[submodule "dREG"]
+	path = dREG
+	url = https://github.com/Danko-Lab/dREG
+[submodule "bigWig"]
+	path = bigWig
+	url = https://github.com/andrelmartins/bigWig.git
+[submodule "dREG-Model"]
+	path = dREG-Model
+	url = https://github.com/Danko-Lab/dREG-Model

bigWig @ d25a16e4

+Subproject commit d25a16e4c853c8fe3a59151820c9f1ace924cbd6

dREG @ 7ea59e30

+Subproject commit 7ea59e300c8d6caaf301a3aa8a3b5b79e4b53807

dREG-Model @ 8d98b2e9

+Subproject commit 8d98b2e96046b0fc5506aec115669e4705b56ea3