Can't get running based off README

[streeter]

So the readme says to call imhotep.py to run the script, but it looks like that file doesn't exist. At least not on master (as of c4ee47e). So I tried instead to call imhotep/main.py, but got the following error:

Traceback (most recent call last):
  File "imhotep/main.py", line 305, in <module>
    imhotep = gen_imhotep(**params)
  File "imhotep/main.py", line 200, in gen_imhotep
    plugins = load_plugins()
  File "imhotep/main.py", line 112, in load_plugins
    klass = ep.load()
  File "/Users/streeter/.virtualenvs/tmp-2582e1239fbec948/lib/python2.7/site-packages/pkg_resources.py", line 2021, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/Users/streeter/.virtualenvs/tmp-2582e1239fbec948/lib/python2.7/site-packages/imhotep_pylint/plugin.py", line 1, in <module>
    from imhotep.tools import Tool
ImportError: No module named imhotep.tools

I fixed that by first running:

python setup.py install

from within the imhotep checkout. So we should update the readme to reflect the new installation instructions.

[scottjab]

I would gladly accept a PR with README updates ;)

[streeter]

Yep, I'm planning on it 😃

[scottjab]

Rad thanks!