generate: Added -w/--watch options for watching source files
Custom generate error
New processor API
Use native Error object
Added dependency: watch
https://github.com/mikeal/watch
Display more detailed info when error occurred
Revert "New processor API"

This reverts commit 9c1553103256917898ded9c094945ad4c83a9457.
Separate functions
Route: Added "clear" method
Simplify generator
Removed path parameter
Added dependency: fs-watch-tree
https://github.com/busterjs/fs-watch-tree
Generate: watch files
Generate: watching files
Fixed duplicate <pre><code> in backtick code block #49
Don't add layout property when creating new article #47
Preview: watching changes
typo
Delete old routes after regeneration
Comment enabled by default #47