Add scala 2.11.4

[oshikiri]

ref #136

[codecov-io]

Codecov Report

Merging #161 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #161   +/-   ##
=======================================
  Coverage   20.91%   20.91%           
=======================================
  Files          27       27           
  Lines        1783     1783           
  Branches        5        5           
=======================================
  Hits          373      373           
  Misses       1410     1410

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