Merge pull request #5 from slaclab/https-submodule

Use https submodule urls

Author: ruck314

.gitmodules

@@ -1,9 +1,9 @@
 [submodule "firmware/submodules/ruckus"]
 	path = firmware/submodules/ruckus
-	url = git@github.com:slaclab/ruckus
+	url = https://github.com/slaclab/ruckus
 [submodule "firmware/submodules/surf"]
 	path = firmware/submodules/surf
-	url = git@github.com:slaclab/surf
+	url = https://github.com/slaclab/surf
 [submodule "firmware/submodules/axi-pcie-core"]
 	path = firmware/submodules/axi-pcie-core
-	url = git@github.com:slaclab/axi-pcie-core
+	url = https://github.com/slaclab/axi-pcie-core