Make railites a hard dep

MSP-11359
Update version_spec.rb for .pre. format tags

MSP-11359

metasploit-concern's version_spec.rb predates bundler using the .pre.
for '-' substitution for tags.
Bump version

MSP-11359

Need to verify regex change is fixed on travis-ci.
Fix spacing on requires

MSP-111359
Fix spacing on requires

MSP-11359
Lands #8, hard-dependency on railties

MSP-11358