Do not assume python... leverage ESS to improve R interaction.
Fix both undo and fontify in the presence of toggling cells (`C-c
C-t`)
Fix and test switching kernels
```
"http://localhost:8888"
"http://localhost:8888/"
"http://127.0.0.1:8888"
"http://127.0.0.1:8888/"
"8888"
8888
```
Ideally these should converge to the same thing. Since many hash
tables are keyed off `url-or-port`, forgetting to
normalize `url-or-port` with `ein:url` leads to missed cache hits and
general malaise. So we try to do that.
Address a FIXME: apply callbacks to `ein:notebook-list-login-and-open`.
Removed py3.5 from travis build matrix to reduce developer strain.
(ein:narrow-to-cell, ein:python-indent-line-function)
(ein:python-indent-region): New functions.
(ein:ml-lang-setup-python): Set
`indent-line-function` to `ein:python-indent-line-function` and
`indent-region-function` to `ein:python-indent-region`.
Images weren't being save to json in the way they should have. Mostly had to do
with how the attirbutes were being ordered. This is still, unfortunately, a
nasty bit code but it still seems to work.
