let's use \verb

See #15, release log:

• 48b3fef by @yegor256: install python
• 3fd6278 by @yegor256: easy_install Pygments
• ba15b72 by @yegor256: copy python 2.7
• 86be0a4 by @yegor256: copy pygmentize
• 8af1da6 by @yegor256: #15 \protected
• 294dc0b by @yegor256: #15 print pygmentize version
• b625e20 by @yegor256: #15 \egroup removed
• 3da060a by @yegor256: #15 enable in math mode
• c1bdd97 by @yegor256: #15 \ff@x
• c53738e by @yegor256: #15 novert
• fdb8871 by @yegor256: #15 vertical bars work

Released by Rultor 2.0-SNAPSHOT, see build log