Feature/add review pr option

use `./eb --review-pr 1017 -D | less -R` to try this out.
TODO:
 - [ ] Compare with other files found in the same PR
 - [ ] add legend on top
 - [ ] add documentation / docstrings
 - [ ] figure out how to display added/removed spaces



flesh out the `os.path.join`, and move the `name.lower(0)` and `name` parts here

or maybe even combine this with `create_paths`:

```python
patterns = [
    exact_version,  # exact match
    '%s-%s-*' % toolchain_name,  # same version, same toolchain name
    '%s-*' % version,    # same version, any toolchain
    '*-%s-*' % toolchain,  # any version, same toolchain
    '*-%s-*' % toolchain_name,  # any version, same toolchain name
    '*',  # any version, any toolchain
]
related_ecs = [glob.glob(cand_path) for pattern in patterns for cand_path in create_paths(path, name, pattern)]
```