v2.6.0

Note: this is the first release to be distributed via github's release system.

• Added support for multiple file/device arguments [Peter Hyman]
• Added --dry-run option
• Handle incorrect octal esc in custom pattern (issue 28)
• Dont truncate custom pattern in display (issue 27)
• Add 'verify' pattern: Quick Fill with 0x00 and verify (issue 22)
• Add unit test coverage for -X, --dry-run, multiple files.
• Untrack and ignore generated files in git (issue 15)
• Project repository: migrated source/releases to github, restored
  pre-v2.2 history from sourceforge; retain Google Code issue tracker
  and wiki for now.
• Doc update: README.md, tests/README, AUTHORS, source code headers.