Enable more than one MjViewer instance at a time #217
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This PR contains a feature and a bug fix which allow an rllab user to open more than one MjViewer window at a time.
Bug fix
MjViewer assumes that, once set during MjViewer.start(), the glfw context never changes. This is not true for multiple windows, which share a global glfw context. Each window needs to switch the glfw context to its own window during rendering.
Feature
Add a kwarg to MjViewer which allows the user to change the window title (useful if you're opening more than one).
Both of these could be solved by upgrading mujoco-py to 1.0+, a project I may take on later. For now, these fixes suffice.