| Age | Commit message (Collapse) | Author | 
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user will be informed if the scroll button indentifier values causes
underflow or overflow.
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Now the scroll_button will not accept:
  - letters on string beginning;
  - negative numbers.
What is tolerated:
  - letters after number;
  - rational numbers: the fraction after dot will be omitted.
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updated error message to be more adequate for current contraint
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and also cleanup spaces
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This commit introduces a scroll_button option, which is intended to be
used with scroll_method. Now user can edit his sway config and add an
scroll_button option to device section.
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