Avoid same error if other line than first change

Only the first line of backtrace was use to mark error like same. Avoid
this behavior because some language ( like python ) change only last
line of backtrace
show errbit version in footer
Bump version to 0.2.0
Merge pull request #563 from anicet/patch-1

Bump version to 0.2.0
Merge pull request #555 from shingara/bugs/not_same_if_change_last_backtrace_line

Avoid same error if other line than first change
Merge branch 'master' into mongoid-3