[Issue JdeRobot#485] Adds python search and as a dependency

- Search python 2 executable as a new dependency.
- Search python module "lib" path and stores it in a variable.

Deps/python2/CMakeLists.txt

@@ -0,0 +1,15 @@
+find_package(PythonInterp 2 REQUIRED)
+
+execute_process(
+  COMMAND ${PYTHON_EXECUTABLE} -c "import os;print(os.path.dirname(os.__file__))"
+  RESULT_VARIABLE _RESULT
+  OUTPUT_VARIABLE PYTHON_MODULE_PATH
+  OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+if(_RESULT)
+  message(FATAL_ERROR "Failed to determine python information")
+endif(_RESULT)
+unset(_RESULT) 
+
+message(${PYTHON_MODULE_PATH})