%store -r restores saved aliases and directory history, as well as variables.
If template is not found by name, exception thrown.
make css highlight style configurable
use traitlet for highlight_class
Remove unused imports from IPython.core
Remove unused imports from IPython.config
Remove unused imports in IPython.lib
Remove unused imports in IPython.utils
Remove unused imports in IPython.extensions
Remove unused imports in IPython.html
Remove unused imports in IPython.kernel
Remove unused imports in IPython.qt
Remove unused imports in IPython.terminal
Remove unused imports in IPython.testing
Fix test import
Exclude frontend shim from docs build

Closes gh-3517
Allow specification of full highlight class in CSSHTMLHeader
Merge pull request #3523 from takluyver/docs-exclude-frontend

Exclude frontend shim from docs build

Closes #3517

The API doc writer has separate exclude patterns for modules and packages, so frontend needed to be listed in the modules exclusions.
Merge pull request #3516 from jakevdp/configurable_highlight

make css highlight style configurable
Add test for storemagic