Merge pull request RobotLocomotion#2775 from mwoehlke-kitware/fix-lcm…

…-python-mismatch

Update LCM to fix Python mismatch
certain systems (particularly OS X with Python from Homebrew) that leads
to using a mismatched interpreter and libraries, and also some problems
with some tool launcher scripts on systems where /bin/sh is not bash
(e.g. Ubuntu).
Temporarily switch to LCM fork

.gitmodules

@@ -15,7 +15,7 @@
 	url = https://github.com/RobotLocomotion/gtk-pod.git
 [submodule "externals/lcm"]
 	path = externals/lcm
-	url = https://github.com/lcm-proj/lcm.git
+	url = https://github.com/mwoehlke-kitware/lcm.git
 [submodule "externals/bot_core_lcmtypes"]
 	path = externals/bot_core_lcmtypes
 	url = https://github.com/mwoehlke-kitware/bot_core_lcmtypes