Avoid SettingWithCopyWarning in ARM5_4 example

These changes fix the following warning from Pandas
(v0.13.1-63-gcc6ee40).

    pandas/core/generic.py:1826: SettingWithCopyWarning:

    A value is trying to be set on a copy of a slice from a DataFrame.
    Try using .loc[row_index,col_indexer] = value instead self[name] =
    value
Use `KeyError` instead of `exceptions.KeyError`

Using `exceptions.KeyError` will lead to a `NameError`. `KeyError`
should be used instead because `KeyError` is already in builtins
namespace and because the exceptions module is not present in Python 3.

This fixes #483.
Merge pull request #484 from kyleam/fix-483

Use `KeyError` instead of `exceptions.KeyError`
Merge pull request #482 from kyleam/fix-pandas-warning

Avoid SettingWithCopyWarning in ARM5_4 example
WIP: Try fixing travis.
Merge pull request #487 from pymc-devs/travis_fix

Fixes to travis.
Update minconda to 3.0.0.
ENH: use super call instead of directly calling __init__ on parent class
Removed unnecessary comment.
Updated .gitignore
Fix for indexing error in #488
Merge pull request #493 from pymc-devs/trace_index_fix

Trace index fix
Updated readme.md to reflect alpha status

Addresses #497
Fixed numpy namespace bug in plots.py
ENH: Added option find_MAP to glm().
Fixed a couple more namespace bugs
Merge branch 'master' of github.com:pymc-devs/pymc