PR: Move rope_patch.py to utils/introspection

[ccordoba12]

Also add pytest's for rope_plugin.

[rlaverde]

test_get_info is failing for me, I tested with defaults and conda-forge channels:
numpy 1.11.2 py35_0

numpy 1.11.2 py35_blas_openblas_200 [blas_openblas] conda-forge

    @pytest.mark.skipif(not numpy, reason="Numpy required")
    def test_get_info():
        source_code = "import numpy; numpy.ones"
        docs = p.get_info(CodeInfo('info', source_code, len(source_code), __file__))
>       assert docs['calltip'].startswith('ones(') and docs['name'] == 'ones'
E       assert (True and 'numpy.core.numeric.ones' == 'ones'
E        +  where True = <built-in method startswith of str object at 0x7f0e2bd21500>('ones(')
E        +    where <built-in method startswith of str object at 0x7f0e2bd21500> = "ones(shape, dtype=None, order='C')".startswith
E         - numpy.core.numeric.ones
E         + ones)

Have I something wrong with my local configuration? I recreate the enviroment with conda create -n spyder spyder python=3.5, conda install pytest pytest-cov pytest-qt numpy pandas, and It's still happening

[ccordoba12]

I tested it locally and it works fine for me, but I'll try to reproduce it with your commands