Merge fluidinfo.py and gae_fluidinfo.py

[gridaphobe]

There's quite a bit of duplicate code between the two. I'd like to reorganize everything such that I can do the following:

# not on gae
>>> import fluidinfo as fi
>>> r = fi.get('/about/...')
>>> r.status
200
>>> r.body
42

# on gae
>>> import fluidinfo.gae as fi
>>> r = fi.get('/about/...')
>>> r.status
200
>>> r.body
42

# gae asynchronous
>>> import fluidinfo.gae as fi
>>> rpc = fi.get('/about/...', async=True)
# later
>>> r = rpc.result()
>>> r.status
200
>>> r.body
42

Basically the only change was the import. Most of this will be straightforward, but we'll need a Response class to present a standard interface for users whether they are on gae or somewhere else.

[ntoll]

Looks good to me :-)

How about:

   >>> from fluidinfo import session
   >>> from fluidinfo.caller import gae, httplib2
   >>> s1 = session(caller=gae)
   >>> s2 = session(caller=httplib2)
   >>> s3 = session() // defaults to something nice
   >>> def onSuccess(result):
   ...  # do something
   >>> s1.get("/users/ntoll", onSuccess=onSuccess) #async
   >>> result = s2.get("/users/ntoll")

Basically, different swappable backends that do the actual HTTP stuff.