OS X Yosemite (10.10) Rosdep entires for python-vtk and libvtk-java

Clean install of ROS Indigo desktop full as per [instructions](http://wiki.ros.org/indigo/Installation/OSX/Homebrew/Source) fails during ros_pcl build due to the lack of mapping for **libvtk-java** and **python-vtk** (see [Issues 4597](https://github.com/ros/rosdistro/issues/4597)). 

**libvtk** is already mapped to the [homebrew](https://brew.sh) **vtk** package. 

Adding lines for **libvtk-java** and **python-vtk** allows the installation to proceed without issue. Tested on MBP 2010, with Yosemite 10.10 with ROS Indigo. 
I think this one should just depend on `libvtk` because it brings in python support. Something like this:

```yaml
python-vtk:
  osx:
    homebrew:
      packages: []
      depends: [libvtk]
```