brakeman: static analysis
rakefile tweak
Merge branch 'master' into brakeman

Conflicts:
	Gemfile
	Gemfile.lock
fix brakeman high-importance warnings

[fixes #33] ops: set up static analysis
update brakeman

[#33]
task for Travis CI to generate token

[#33]
Merge pull request #46 from alxndr/brakeman

set up Brakeman and fix warnings