drop unused valgrind package from installation
... and remove explicit gcc installation (will be installed with g++ automatically)
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		@@ -22,10 +22,8 @@ addons:
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    - ubuntu-toolchain-r-test
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					    - ubuntu-toolchain-r-test
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    - llvm-toolchain-precise-3.7
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					    - llvm-toolchain-precise-3.7
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    packages:
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					    packages:
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    - gcc-4.9
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    - g++-4.9
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					    - g++-4.9
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    - clang-3.7
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					    - clang-3.7
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    - valgrind
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os:
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					os:
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  - linux
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					  - linux
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  - osx
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					  - osx
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