adding test for passing a function to tangelo.accessor
adding data clustering with tests
Renaming coordinate accessors and clustering package
Updating flickr app.

 * new data source (mongodb: localhost -> tangelo -> flickr_paris)
 * displaying image data via url property
Adding flickr data retrieval script.

This also includes changes to the flickr app to reflect a more "native" form of
data (closer to the fieldnames delivered by the Flickr API itself).
Added data prep documentation about Flickr app.
Adding data retrieval script, updating app to display message about data prep docs
Merge branch 'flickr-api-data'
Removing charitynet (moved to xdata-app-pack)
Merge branch 'move-charitynet-out'
Added enron data instructions

Changed enron app to work from localhost mongo.

Added database and collection parameters to enron config.
General updates to make enron app behave better.

Added documentation links to error messages for both flickr and enron.
Merge branch 'enron-data'
Exclude .pyc files, and generated tests, from generated python package.
Merge branch 'exclude-tests-pyc'

Closes #290
Preparing to abstract version number from setup.py

Made globbing for tangelo directory a bit less shotgunny

Configuring setup.py via "copy only" operation
Abstracted version from setup.py
Abstracted version number from core.js
Abstracted version number from documentation.
Merge branch 'version-num-abstraction'

The version number is specified in exactly one point in the sources now -
CMakeLists.txt in the top level.