All: Replace symlink with copying file for Windows compat

Also replace colors module with chalk

Fixes #8
1.8.0
Validate: Stop validation at scissor comment, supports verbose output

Requires git 1.8.5+ for the scissor line to be included before the verbose
output.

See https://github.com/git/git/commit/1a72cfd7fa88e5a6c2b94568ac2fe69dfbd87f87

Fixes #15
Closes #19