Allow classic prompts without space.

Closes gh-2790
Merge pull request #3482 from vitaut/master

Use an absolute path to iptest, closes #3480
Merge pull request #3483 from takluyver/i2790

Inputtransformer: Allow classic prompts without space
SymPy has changed its recommended way to initialize printing
Add test for non-ascii characters in docstrings

Closes gh-1179
Merge pull request #3486 from takluyver/test_unicode_pinfo

Add test for non-ascii characters in docstrings

closes #1179
Merge pull request #3485 from asmeurer/sympy

SymPy has changed its recommended way to initialize printing
Remove unexpected keyword parameter to remove_kernel

Closes gh-3474
Merge pull request #3491 from takluyver/notebook-kernel-died

Remove unexpected keyword parameter to remove_kernel

now is a relic from before cleaning up the kernel manager / restart logic

closes #3474
Fix import errors in tests by adding ipython dir to $PYTHONPATH