release fix for possible infinite recursion on <bs>

when s:SuperTabNoCompleteAfter has been modified by the user, then eclim
will remap <bs>. However a recent change[1] modify the s:CompletionReset
code to call the second <bs> char as the mapped version, which if
supertab has it mapped, results in an infinite loop under these
conditions.

fixes #120

[1] https://github.com/ervandew/supertab/commit/c8c1876