Fix example Sandbox connection

The code sample for connecting to a sandbox produced an 2 python errors.  This should fix it.
Merge pull request #6 from jlantz/patch-1

Fix example Sandbox connection
Fix for usernames and/or passwords that contain invalid xml characters.
Remove accidentally committed printf debug.
Merge pull request #9 from mayfield/master

Fix for username/password with invalid xml chars
Copying in our apexecute additions as well as some PEP8 jazz
Added the ability to login wihtout security token where the ip filtering
authentication method is in use. Created a new constructor for
SalesforceLogin which takes the following params username, password,
organizationId, sandbox=False,sf_version='23.0' and uses slightly
different login soap request.
Enable 2to3 for setuptools installs.
Merge pull request #12 from mayfield/master

Enable 2to3 for setuptools installs.
Added descriptions for the new Salesforce authentication method of IP
Filtering
Use a reusable requests.Session object.

Reusing the same request.Session object provides better performance
for back-to-back queries as it lets urllib3 reuse the same socket when
appropriate.
Fixed a bug where SalesforceLogin was overwritten by a method with the same name and refactored both functions into a
single one to support both IP Filtering and Security Token authentications methods
Merge pull request #11 from davideagle/master

Added the ability to login wihtout security token
Merge pull request #13 from mayfield/master

Use a reusable requests.Session object.
fix issue #14
finish issue #16. upgrade to version 0.29 since deleted wasn't supported on 0.27
add deleted information on README
Merge pull request #15 from llazzaro/master

fix issue #14 and #16
Updating README.rst

Formatting and wording changes
PEP8/Style Improvements

Adding file/module doctoring. Changed docstrings to use double quotes. Changed tabs to soft (4 space) tabs. Removed trailing whitespace. Made sure there was a newline at the end of each file.

Handling more long (80+ char) line lengths is a big todo