fix boost unit test linkage on mac os

it turns out we use static version of boost on mac os X too.

Change-Id: I7e358be22f2c20e4590f90a4c4034113943c4211
add a test for the timer

the result of the test is not very important, I mainly added the test to
sort out compilation problems

Change-Id: I7b1716e2bef88677fb516f68a430e796c82c65e3
test_transform: remove using namespace std

Not sure this change was needed to fix the clang bug. But it does not harm.

Change-Id: I4f8c62b1c0601debfde01e20d6c0ef82a00b70cc
fix mac64 build

strangely enough, without this change, I had errors like:

    /metapod/include/metapod/tools/spatial/transform.hh:162:29: error: use of overloaded operator '=' is ambiguous (with operand types 'Block<Eigen::Matrix<double, 6, 6, 0, 6, 6>, 3, 3>' and 'const ConstantReturnType' (aka 'const CwiseNullaryOp<internal::scalar_constant_op<Scalar>, Eigen::Matrix<double, 3, 3, 0, 3, 3>>'))
              M.block<3,3>(0,3) = Matrix3d::Zero();

with clang from Xcode 4.6 "LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)"
and eigen 3.0.5.

There are numerous reports of similar problems

        http://eigen.tuxfamily.org/bz/show_bug.cgi?id=543
        http://forum.kde.org/viewtopic.php?f=74&t=102653
        http://forum.kde.org/viewtopic.php?f=74&t=94316#p192620
        http://www.pcl-users.org/More-Eigen-OSX-issues-td4021251.html

Probably a clang or an Eigen bug

Change-Id: I937ef51b13790974e98d5ac11cc6f5082fa613f3
cmake: build sample urdf models as shared libs on windows too

Change-Id: Ifdd24b9a9507f8cc37d4820fb61d7baacae50564
jac.hh: fix style

Change-Id: I1fb85cc32c5ac3af2de646114cddc977fcd0aa3f
fix compile error C2582 on windows

The const member prevented the compiler to generate the assignment
operator. This in turn made the urdf examples fail compile on Windows.

It seems the assignement operator is needed on Windows but not on the
other platforms, I do not know why.

Change-Id: Iae6fc015b43e3ede59136d968b96d099e8982a2b
cmake: fix METAPODFROMURDF_EXECUTABLE bing overwritten

Change-Id: Ifae8501bb51acd33733d7db44856583a1579a0c2
Merge pull request #64 from sbarthelemy/fix_mac

Fix mac