Bollinger Band glyph example

added an example for creating a bollinger band glyph
Added bollinger band glyph (notebook)

ipython notebook example of a boillinger band glyph.
Bollinger band server example

Added an example for creating a Bollinger band glyph in bokeh-server.
Python 3 Support.

This introduces the new dependency `six` and enables Python 3.3 support
for everything but the `bokeh-server` which depends on `gevent-websocket`.
running the bokehserver with splitjs False and devjs True does not work.

This is because there is an inconsistency with build/release js paths, and
what is on the server.

I think it is easier to standardize on our bokeh.js living inside build/js, or release/js

This commit
- modifies the Gruntfile to build into build/js and release/js
- modifies setup.py to look for files in that directory
- renames JSROOT to BOKEHJSROOT, since the name JSROOT is a bit misleading, as we have things like css in there
- fixes an os.path.join call which had 'static/js' as an arguemnt, since that's not platform agnostic

This isn't really tested yet, so I would merge this after I get a chance to test it but I wanted to open the PR first.
Merge pull request #234 from filmor/python3

Python 3 support
 fixed template error
bollinger band examples 2.0

heavily simplified bollinger band examples
Merge pull request #241 from rpazyaquian/master

Bollinger band examples
Revert " fixed template error"

This reverts commit 5f67706577b21a647771d9465ec0f9b300c68fb1.
adding statics
Merge pull request #250 from ContinuumIO/bugfix/build_error

Bugfix/build error
fixing push
pull function is broken - it calls session.load, which doesn't exist, and if ref is None, won't work...
Merge pull request #247 from ContinuumIO/bugfix/devjs_with_not_splitjs_is_broken

running the bokehserver with splitjs False and devjs True does not work.
Merge pull request #248 from shughes-uk/master

BaseGlyph testing and refactoring test_properties
allowing pandas dataframes to be passed directly into ColumnDataSources
semi-fixing hold behavior for notebook
adding mpg dataset
monkeypatching HasProperties.sync such that saving selections work for embedded plots