Piper

Fixed
- Elevate `attmap` depdendency bound to require inclusion of improved path expansion behavior.

Fixed
- Elevate `attmap` dependency bound to require inclusion of a bugfix there.

- Improve python3 handling of integers and strings
- Fixed a bug with cleanup scripts in `dirty` mode
- Restructured profile output with hash and processID, and made lock paths relative
- Streamlined some logging outputs
- Allows nested parenthesies and braces for piped commands
- Fixed a bug that would have split a pipe within a braced command
- Some performance improvements for ngstk functions
- Allow `ngstk.input_to_fastq` to yield gzipped fastq files

- Fixed a bug that raised exception with empty commands
- Fixed the pipeline profiling issues
- Major updates to internal systems: Switch to `attmap`
- Revamped way of handling child subprocesses which should lead to more
efficient memory monitoring of piped subprocesses, and more consistent
handling of rogues subprocesses during pipeline failure.
- Added force mode to ngstk `gzip` and `pigz` use.
- Changed documentation from sphinx to mkdocs.
- Fixed a bug with python3 output buffering
- Implement multi-target commands
- Fixed a bug that had prevented new start mode from working in certain cases.
- Allow user to change units of memory passed in with default pypiper cli.

- Point release to PyPI for README rendering.

- Simple point release update to fix PyPI landing page.