New steps needed to install Linuxbrew

[tseemann]

The order is important.

unset HOMEBREW_DEVELOPER
export PATH=/home/linuxbrew/.linuxbrew/bin:$PATH

git clone https://github.com/Linuxbrew/brew.git /home/linuxbrew/.linuxbrew

brew install hello ruby # will install glibc etc
brew test hello

cd /home/linuxbrew/.linuxbrew/Cellar/glibc/2.19/lib   # check correct version!
ln -s ../../../gcc/5.3.0/lib/libgcc_s.so.1 .

brew install python python3 r

brew tap homebrew/science
brew install bwa
brew test bwa