message: Change boost version at docs to boost 1.64
diff: @@ -23,13 +23,13 @@ Update and install git, gcc, gmp, and open ssl. On Ubuntu environment is should
  Download and install boost (the last step might take some time. patience): ::
  - $ wget -O boost_1_60_0.tar.bz2 http://sourceforge.net/projects/boost/files/boost/1.60.0/boost_1_60_0.tar.bz2/download
  - $ tar --bzip2 -xf boost_1_60_0.tar.bz2
  - $ cd boost_1_60_0
  + $ wget -O boost_1_64_0.tar.bz2 http://sourceforge.net/projects/boost/files/boost/1.64.0/boost_1_64_0.tar.bz2/download
  + $ tar --bzip2 -xf boost_1_64_0.tar.bz2
  + $ cd boost_1_64_0
  $ ./bootstrap.sh
  $ ./b2
  -More details about boost here: http://www.boost.org/doc/libs/1_60_0/more/getting_started/unix-variants.html
  +More details about boost here: http://www.boost.org/doc/libs/1_64_0/more/getting_started/unix-variants.html
  Building libscapi and publishing libs
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  