Adding support for clang 3.5. Fixes #55

[Konstantin8105]

fix #55

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This change is 

[codecov]

Codecov Report

Merging #418 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #418   +/-   ##
=======================================
  Coverage   80.36%   80.36%           
=======================================
  Files         145      145           
  Lines        6388     6388           
=======================================
  Hits         5134     5134           
  Misses       1005     1005           
  Partials      249      249

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[elliotchance]

Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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.travis.yml, line 18 at r1 (raw file):

      os: linux
    - env: SCRIPT=test CLANG=3.5
      os: linux

That's cool. This did not work before (that's why I had to remove it).

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