Test py36, spark 2.1.1 on travis

[parente]

Fixes #27.

[codecov]

Codecov Report

Merging #33 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #33   +/-   ##
=======================================
  Coverage   85.35%   85.35%           
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  Files           6        6           
  Lines         403      403           
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  Hits          344      344           
  Misses         59       59

[parente]

@basnijholt the jupyter kernel test and unit test suites pass with py35 and py36 on travis. I'm updating the Makefile to create a py36 environment for development and will poke around a bit in live notebooks.

[parente]

Running locally, it looks like there's an issue in metakernel's shell_magic when spawning a spylon-kernel in Python 3.6.

[MetaKernelApp] ERROR | Can't load '/Users/parente/miniconda3/envs/spylon-kernel-dev/lib/python3.6/site-packages/metakernel/magics/shell_magic.py': error: Timeout exceeded.
<pexpect.pty_spawn.spawn object at 0x109706f98>
command: /bin/bash
args: [b'/bin/bash', b'--rcfile', b'/Users/parente/miniconda3/envs/spylon-kernel-dev/lib/python3.6/site-packages/metakernel/bashrc.sh']
buffer (last 100 chars): '\x1b[?1034h(spylon-kernel-dev) '
before (last 100 chars): '\x1b[?1034h(spylon-kernel-dev) '
after: <class 'pexpect.exceptions.TIMEOUT'>
match: None
match_index: None
exitstatus: None
flag_eof: False
pid: 88201
child_fd: 54
closed: False
timeout: 30
delimiter: <class 'pexpect.exceptions.EOF'>
logfile: None
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
searcher: searcher_re:
    0: re.compile("[$#]")

The kernel eventually comes up, but there's a long delay. I'll need to produce a smaller reproducible case and file upstream.

[parente]

The exception above is not due to py36. Something changed in my OSX setup that is causing pexpect to fail. I can reproduce it on py35 now too, but not when I switch to my Linux dev environment. So ... not important right now.