#2 Compilation fixes

[matthieu637]

Hello,
I'd like to report some compilation errors :

-- The use of min/max instead of std::min/std::max in src/utils/mdarray.h:
http://stackoverflow.com/questions/13701897/could-not-find-boost

-- In src/utils/mdarray.h in the function MDArray<t>::inv(), you use</t>

goto bailout;

in bailout you use the variable "a" (set_values(a);) however it isn't set in if work == NULL.

-- In examples/CMakeLists.txt, mlr-uni also needs the boost system library.