Hide-code

* Fixed nbconvert CLI interface. nbconvert --to hide_code_latex, --to hide_code_pdflatex and --to hide_code_slides now work correctly (Resolves 49 & 55).
* Fixed issue passing STDOUT text correctly into templates (Resolves 54, 58, & 50). Contributed by mourikwa.

v.0.5.0
* Added exporting latex templates and reveal slides. Resolves 31 and 36.
* Updated templates to work with nbconvert 5.x. Resolves 26 and 33.
* Updated toolbar buttons for notebook 5.1+. Updates are not compatible with notebook < 5.1.
* Updated to use absolute instead of relative path references when exporting a notebook. Resolves 38.

- Added keyboard shortcuts. Resolves issue 32.
- Added nbextension installation. Resolves issue 27 and 29.
- Added method method to clean up bootstrapped JS files in versions 0.3.1 and below. See [uninstalling](https://github.com/kirbs-/hide_code/wiki/Uninstalling) documentation. Resolves #28.

- Fixed issue with finding site-packages path on some python installations.

- Added output hiding.
- Added configuration managar.
- Added PDF exporting via nbconvert's LaTeX exporter.
- Fixed bug with notebooks in sub-folders not exporting.

- Fixed issue with exported output padding/clipping.
- Fixed issue with kernel disconnecting from UI after exporting
- Added logging and debugging support.

- Added HTML and PDF exporting.
- Removed support for Python 3.2.