Sweeping changes across the board.
- Configuration is done to its own class.
- Improved readability of the code a bit.
- Option -d accepts '%title', which will be replaced with the title of the manga.
- Reading user config, options and arguments is in its own function.
- README updated to reflect the new changes.
- Support for chaining multiple URLs in one command.
Duplicate chapter check is now only performed on selected range.
Relegated downloading to scraper classes, zipping to Crawler class.
Chapter numbers are now passed as floats if possible.
This makes scope specification less stringent (Chapter '004' on KissManga can be specified with just '4').
It also makes specifying the output filename in Manager easier, as you can just check if the type is float.
Add '%title_' as a possible option for '-d'.
Merge pull request #5 from Hamuko/master

Merge improvements and future-proofing