Ppsp

Changed
- README now gives accurate install instructions via pip

Added
- Ability to only start capturing output and allowing commands to be issued when process output line matches start condition

Changed
- exit_condition positional argument now replaced with keyword arguments for start_condition regex string and exit_condition regex string

Removed
- Positional argument for exit_condition

Fixed
- Removed accidental pass keyword where regex exit condition would not be set to None on error

Changed
- Changed stdin/stdout buffering to -1 (default) for subprocess to properly process data as binary buffered
- Removed unecessary conditionals

Fixed
- Broken pipe errors not being handled
- Issue where stdin would error but input would already be removed from input queue

Added
- Docstrings to classes and functions

Fixed
- PPSP stop function explicitly sets stopping flag to True to stop execution every time when calling it

Added
- Ability to run multiple shell commands at one time
- example2.py for an example of multiple shell commands at once

Changed
- Shell commands now get executed in a daemon thread and must be stopped when status is stopping
- Made PPSP class private

Removed
- PPSP Exception classes