Merge pull request #242 from personalrobotics/bugfix/missing_import

Added missing 'import'.

Author: mkoval

src/prpy/base/wam.py

@@ -28,6 +28,7 @@
 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 
+import math
 import logging
 import numpy
 import openravepy