Stata-kernel

- Don't embed images in HTML help; link to them. 140
- Fix blocking for line continuation when string is before `{` 139
- Fix hiding of code lines with leading whitespace. 120
- Remove `stata_kernel_graph_counter` from globals suggestions. 109
- Always use UTF-8 encoding when loading SVGs. 130
- Add download count and Atom gif to README. Try to fix images for Pypi page.

- Fully hide Stata GUI on Windows. Always export log file, even on Windows and Mac Automation.
- Set more off within ado files. Should fix 132.
- Use bumpversion for easy version number updating.
- Add `%help kernel` and `%help magics` options
- Add general debugging information (like OS/Stata version/package version) to log
- Add help links to Jupyter Notebook's Help dropdown UI
- Various docs fixes

- Release to pypi again because 1.4.2 didn't upload correctly. Apparently only a
Mac version was uploaded, and even that didn't work.

- Fix line cleaning for loops/programs of more than 9 lines
- Remove pexpect timeout
- Provide error message upon incomplete input sent to `do_execute`

- Add `%head` and `%tail` magics
- Change `%set plot` to `%set graph`

- Return results as Stata returns them, not when command finishes
- More stable method of knowing when a command finishes by looking for the text's MD5 hash
- Finds Stata executable during install
- Automatically show graphs after graph commands
- Add %help and %browse magics
- Allow for graph scaling factors
- Fix Windows locals issue
- Fix image spacing