Merge the login and open commands (open aliased to login). Add login
tests described in #352.
Attempt to improve user experience by synchronously executing
`ein:jupyter-server-start`. `ein:dev-prefer-deferred` custom variable
allows easy switch to compare sychronous versus old asynchronous behavior.
For whatever reason, emacs-26.1-travis consistently fails to download an ess
dependency.
`Dependency ess failed to install:
https://melpa.org/packages/julia-mode-20180816.2117.el: Bad Request`
Remove emacs-26.1 from the build matrix until I figure this out.
```
"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.
Use deferred and callbacks instead of `:sync t` for tkf requests which
is known to have issues. Query server attributes once on
notebooklist-open to avoid sequencing issue #176 (but allow Resync).
Under curl backend, a second request for the same "key" as a pending
request will abort the latter, which has resulted in a clobbered
curl-cookie-jar file, so merely warn and don't abort.
Fix#176
1. no need to install git explicitly.
2. install emacs before `cask install`, otherwise the cask packages
are installed for system emacs.
3. pip installation as root, otherwise the debug session
travis_run_install hangs with 'Permission Denied'.
emacs-lisp language no longer seems to be an option. Going with Python
is a better deal anyway, since we get access to setuptools and don't
have to mess around with virtualenv's or the convoluted Makefile.
No longer set buffer-file-name for ein:notebook buffers. This was
causing unexpected and potentially disastrous (as in data corruption)
behavior.
Some updates to travis configuration and testing. Still a long ways
from having that working, though.
Progressing back towards having automated testing via travis. Updated
contact info for ein:dev-bug-report-template and updated requirements in
README.rst.
