Allow filename with extension in find_cmd in Windows.

closes gh-3316 (hopefully)
Drop patch for compatibility with pyreadline 1.5

Closes gh-1307
Added shorcuts to split cell, merge cell above and merge cell below.
Added '-' as a shortcut for splitting cells.
use DEFAULT_STATIC_FILES_PATH in a test instead of package dir

allows post installation tests with split static data to succeed
Fix test for Python 3 on Windows.

IPython.core.tests.test_run.test_aggressive_namespace_cleanup
Added missing slash to print-pdf call.
Merge pull request #3627 from juliantaylor/static-path

use DEFAULT_STATIC_FILES_PATH in a test instead of package dir

allows post installation tests with split static data to succeed
Fix typo
Merge pull request #3642 from mspacek/docs

Fix typo in docs
Merge pull request #3628 from takluyver/win-test-aggressive-namespace-cleanup

Fix test for Python 3 on Windows.
Merge pull request #3338 from takluyver/i3316

closes #3316

According to [documentation here](http://docs.activestate.com/activepython/2.4/pywin32/win32api__SearchPath_meth.html),
SearchPath takes an optional third parameter for the extension,
which is only added if the filename doesn't have an extension.
Merge pull request #3487 from takluyver/drop_old_pyreadline

Drop patch for compatibility with pyreadline 1.5

Closes #1307
Merge pull request #3635 from damianavila/fix_print

Added missing slash to print-pdf call.

closes #3634
Merge pull request #3571 from damianavila/split_shortcut

Added `^M -` as shorcut to split cell.