Removed rope as a dependency from elpy.rcp.

recipes/elpy.rcp:
        Removed the rope dependency from elpy. The rope dependency in
        el-get includes the full rope python library. While this is very
        convenient for installing el-get packages that require the rope
        library, it poses a major problem for Python 3 users of
        elpy. Elpy is itself fully capable of working with either python
        3 or python 2, but if it is being used with python 3 it requires
        an alternative version of rope in order to function,
        rope_py3k (https://github.com/jorgenschaefer/elpy/wiki).

        Having rope as a dependency of elpy overrides whatever version
        of rope is installed on the local machine, and prevents users of
        elpy through el-get from using elpy with Python 3 without using
        a custom recipe.

        It is better to have the users install the library themselves
        locally, rather than pulling the version 2 specific one as a
        dependency. This shouldn't be an issue as elpy users already
        have to manually install many other libraries on the system to
        support the elpy frontend (such as jedi).