Byebug is now warning free

Most of the "tropecientos" warnings removed were harmless but having
such a cluttered output in warning mode might hide some important stuff
in the future... Warnings are now enabled by default. Test suite
performance has been slightly degraded due to (I guess) higher (dummy)
object creation, I'll fix that.
Merge branch 'master' of github.com:deivid-rodriguez/byebug

Forgot to update my working copy with contributed changes before
committing my changes...