Add EventfulList and EventfulDict trait types.
Address review comments @takluyver
Added on_events convinience method
Use ternary operator for callback registration
kwarg on_events and hardcoded callbacks
s/this/self
rmagic is now in rpy2.ipython
updates to release scripts

- unicode tweaks in github_stats
- remove unused Windows and egg bits
- update Python 3 builder to 3.4
Merge pull request #6279 from minrk/release-tweaks

minor updates to release scripts
nbconvert requires mistune

You get a cryptic error message from iptest if mistune is not installed.

Test group: nbconvert
E
======================================================================
ERROR: Failure: AttributeError ('module' object has no attribute 'nbconvert')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/nose/loader.py", line 403, in loadTestsFromName
    module = resolve_name(addr.module)
  File "/usr/lib/python2.7/dist-packages/nose/util.py", line 321, in resolve_name
    obj = getattr(obj, part)
AttributeError: 'module' object has no attribute 'nbconvert'

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (errors=1
Merge pull request #6280 from ivanov/mistune

nbconvert requires mistune
Default view should be the base widget view class
Add failing test for issue gh-6282
Cast module name to bytes for Py2 ModuleType constructor

Closes gh-6282
Merge pull request #6277 from takluyver/doc-rmagic-rpy-ipython

Update docs location of rmagic in rpy2
Merge pull request #6286 from takluyver/i6282

Fix issue 6282
Merge pull request #6228 from jdfreder/eventful-list-dict

Add EventfulList and EventfulDict trait types.
Update wrapperkernels.rst

Fixed typo experssions -> expressions. 

This page also needs to mention the command to get started:

```shell
ipython console --kernel echo
```

And needs to point to creating a profile to use the EchoKernel in a notebook.
Merge pull request #6292 from dsblank/master

Update wrapperkernels.rst
Merge pull request #6284 from jasongrout/patch-6

Default view should be the base widget view class