Merge pull request #197 from szemek/master

Remove ansi escape codes from roodi output
Bump to 4.7.3, update HISTORY
Add checksum for metric_fu-4.7.3.gem
Update travis.yml to specify jruby, not jruby-19mode
Update CONTRIBUTORS, erd for 4.7.3
Stub DEV.md, instructions for developers
RCov generator properly requires LineNumbers

Only relies on Rake when running externally
RCov is enabled when a coverage file is specified and exists
Merge pull request #156 from metricfu/conditionally_enable_rcov

[Fix] Ensure external coverage file exists before running coverage metrics

Closes #76