overlord exercise
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Fixed name regex

Previous regex was malformed, and also matched the first two
characters to any alphanumeric character rather than any
alphabetical character
Merge pull request #1 from sshao/sshao/robot_name_regex

Fixed name regex in short_methods/robot_name.rb
Merge remote-tracking branch 'upstream/master'

Conflicts:
	short_methods/robot_name.rb