Compilation in OSX 

I had to go through these steps to be able to compile in my Mac, which has gcc 4.2 by default. 
Thought it would be worth sharing. 

First install gcc49, but this is not gonna change the default behavior: 
```
brew install gcc49 
```

In command-line, create aliases for gcc 4.9:
```
export CC=/usr/local/bin/gcc-4.9
export CXX=/usr/local/bin/g++-4.9
export CPP=/usr/local/bin/cpp-4.9
export LD=/usr/local/bin/gcc-4.9
alias c++=/usr/local/bin/c++-4.9
alias g++=/usr/local/bin/g++-4.9
alias gcc=/usr/local/bin/gcc-4.9
alias cpp=/usr/local/bin/cpp-4.9
alias ld=/usr/local/bin/gcc-4.9
alias cc=/usr/local/bin/gcc-4.9
```

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Compilation in OSX #60

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Compilation in OSX #60

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