Checking in notebooks for analysis of Tim O'Reilly, Lady Gaga, and Marissa Mayer
Minor updates to the notebooks with a few more comparisons.
Fixed a typo. Thanks @ramsoft
Refs #102. Thanks bdewilde
Adding in extra robustness for make_twitter_request
Adding new demo notebook.

Demonstrates how to analyze data from Twitter's firehose with pandas.
Fixing typo
Renaming file with double quotes

Apparently Windows doesn't allows this and it causes issues on a "git
clone" - See
http://msdn.microsoft.com/en-us/library/aa365247(VS.85).aspx
Added config for adjusting memory, vanilla AMI for AWS config
Commenting out optional NLTK downloads during provisioning
Updating Chef recipe to account for new pip 1.5 requirements usage
Fixes an edge case in handling LinkedIn job titles

Titles without symmetric whitespace such as
"Researcher/ PhD Candidate" were triggering unexpected issues because a
strip() was not being called. Fixed this issue and potentially another
one in how 'and' was being used as a title separator.

Refs #58 - Thanks @drcjar for re-engaging on this issue!
Fixes #123, Fixes #124. (Bugs in Example 9-22.) Thanks @psychemedia!