add more marks, transforms, and properties

* some field references remain unhandled
add more transform properties
start of simplifying ipython notebook use
fix string format error bugs and adapt examples

* adjust examples to new format
* simplified notebook related code
make format conform with flake8 for travis CI
correct test for word and formatting for flake8
fix Word test for real
Merge pull request #99 from Midnighter/transforms

add more marks, transforms and properties
Merge pull request #100 from Midnighter/ipynb

Change the IPython Notebook integration
STY: PEP8 cleanups

REF: Remove unwanted notebooks
STY/REF: PEP8 cleanups in tests, remove commented code
ENH: Add convenience method for axis properties)
REF/ENH: Add/update convenience methods for axis formatting
ENH: Legend text_color option
REF: Update javascript loading to work with static nbviewer
Merge pull request #105 from wrobstory/PR_js-load

REF: Update javascript loading to work with static nbviewer
ENH: Update example notebook for word cloud move
REF: Change iterkv to iteritems due to pandas depreciation
ENH: Add convenience method for editing color range
ENH: Return self to enable method chaining