Pss

- Adding support to known files: .txtar, .wat
- Adding .ipynb_checkpoints to IGNORED_DIRS (74)
- Clean up testing setup; support newer Python versions

- Fixed a bug in --smart-case with Python 3 (67)
- Added Rust to known types
- Python 2.7 support dropped; pss Python 3-only now.

- Added new types: QML, TypeScript, go.mod, Toml, Dockerfile.
- Support for multiple include and exclude patterns (56)
- Improve compatibility with newer versions of Python 3
- Updated version of colorama which fixed some old-standing issues with color
output.

- Added a new option: --exclude-pattern to exclude files matching a regex.
This is the inverse of -G, since negative regexes are sometimes tricky to
craft. Also -G got a synonym: --include-pattern
- Added new types: JSX, TypeScript, SCSS, R, Jinja2, Terraform, Dart
- Added options to suppress printing line numbers (41)
- Made --hs a synonym for --haskell
- Added support for universal newlines (36)

- Added --julia, --vhdl and --verilog types (pull requests 29, 30).
- Added support for Bazel types (BUILD, .bzl), Clojure, Markdown, Protobuf.
- Colorama updated to newer version (33).

- Added .metadata directory to ignore list (issue 17).
- Added the .haml extension for Ruby
- Added new types: CUDA (.cu), OpenCL (.cl)
- Added --td as a short-name for --tablegen
- Use new capabilities of setuptools if available, when creating a
distribution for Windows (pull request 18)
- Added Bash completion script in tools/pss-bash-completion.bash, along with a
special option for pss to dump the list of types for it.
- Exit with a return code similarly as ack and grep (issue 24).
0: Match found or help/version printed. 1: No match. 2: Error.