Haros

Fixed
- Fixed a bug when parsing launch files that complained about unicode strings.

Changed
- Internal code changes to support Python 3 environments.

Added
- Added the `news` command, to print out some news updates.

Fixed
- Fixed a bug with namespace resolution when extracting topic/service/param function calls.

Added
- Added convenience methods to some metamodel classes.

Added
- `analysis` section to project files, same as in `~/.haros/configs.yaml`.

Fixed
- Viz now shows which conditional statement is associated with each conditional expression (e.g., `if`, `for`, etc.).
- Node HPL properties were not being properly read from project files.

Changed
- Docker files moved over to the `make-haros-easy` repository. New and improved files have been added in that repository, thanks to ipa-nhg.
- HPL parsing is now delegated to the external `hpl-specs` package.