Add Eigen as git submodule

The new pybind11 bindings require at least Eigen-3.2.7. Travis and Ubuntu 14.04 only include Eigen-3.2.2, so let's include Eigen as a submodule. Unfortunately Eigen uses Mercurial and no official git mirror exists, so I've cloned Eigen's mercurial repo and added it at patrikhuber/eigen.git at version tag 3.3.3.

Add Eigen as git submodule
The new pybind11 bindings require at least Eigen-3.2.7. Travis and Ubuntu 14.04 only include Eigen-3.2.2, so let's include Eigen as a submodule. Unfortunately Eigen uses Mercurial and no official git mirror exists, so I've cloned Eigen's mercurial repo and added it at patrikhuber/eigen.git at version tag 3.3.3.
351e6959 · Patrik Huber · 10a5a951 · 351e6959 · 52378f92
Commit 351e6959 authored Mar 06, 2017 by Patrik Huber
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.gitmodules .gitmodules +3 -0

3rdparty/eigen 3rdparty/eigen +1 -0

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--- a/.gitmodules
+++ b/.gitmodules
@@ -16,3 +16,6 @@
 [submodule "3rdparty/cereal"]
 	path = 3rdparty/cereal
 	url = https://github.com/USCiLab/cereal.git
+[submodule "3rdparty/eigen"]
+	path = 3rdparty/eigen
+	url = https://github.com/patrikhuber/eigen.git
--- a/eigen @ 52378f92
+++ b/eigen @ 52378f92
+Subproject commit 52378f92247c2318f9a6686be9447bc2f45e5588