Updates requests package. 0.14.1 -> 0.14.2
Updates pytz package to latest. 2011n -> 2012h
Upgrades nose package to latest. 1.1.2 -> 1.2.1
Upgrades msgpack-python package to latest. 0.1.12 -> 0.2.2
Upgrades Cython package to latest. 0.15.1 -> 0.17.1
Updates Logbook package to latest. 0.3 -> 0.4
Updates ipython to the latest. 0.12 -> 0.13.1
Upgrades numpy package to latest. 1.6.1 -> 1.6.2
Locks down the ability to easily override the algo's portfolio.

Starting down the path of making the portfolio completely read-only
with respect to the handle_data in algo.

The portfolio should only be changed during the course of running
the algorithm by the simulator.

This doesn't do a 100% protection, i.e. an algo could use _portfolio,
or the set_attr property, but hoping this helps guides algo writing
to treat the portfolio as read-only.
Merge pull request #9 from quantopian/protect-portfolio

Locks down the ability to easily override the algo's portfolio.
Fixed batch_transform window length not being market aware.

Added accompanying unittest.

Minor refactoring of unittests and factory.
Adds requests library to setup's required libraries.

So that loading of external data works 'out of the box'.
Changes the location of downloaded external data files.

So that the zipline library can be used when installed to a
write-protected location, e.g. the global site-packages,
moving the download files to a directory in the user's path,
which should be writeable.

For now, choosing a ~/.zipline/data location.
Removes `created` member from risk metrics.

`created` was being set, but unused.

It is one of the rare uses of the epoch_now and EPOCH,
so removing on the path of trimming down date_utils.
Merge pull request #16 from quantopian/remove-created-field-from-risk

Removes `created` member from risk metrics.
Merge pull request #15 from quantopian/allow-data-when-installed-as-root

Allows data downloads when installed as root
Fixed unittest2 import error on Python 2.7

Changed all unittest2 imports to unittest
Removes unittest2 from dev installed packages.

We removed unittest2 from our test suites in favor of the builtin
unittest from Python 2.7+
Bumps release to 0.5.2.

Mainly fixes to imports and downloading of resources that were
preventing installations.
DOC: Fixed some paragraph alignment and table formatting issues.