For example, when only a single file (or stdin) is being searched, then we
should be able to print directly to the terminal instead of intermediate
buffers. (The buffers are only necessary for parallelism.)
Closes#4.
- Refactored interaction between CLI args and rest of xrep.
- Filling in a lot more options, including file type filtering.
- Fixing some bugs in globbing/ignoring.
- More documentation.