Fix build error using g++ 4.9.3

[lam2mo]

Here's the error I was getting:

$ make
g++ -o main.o -Ilib -Itest -O2 -Wall -g -c main.cpp
main.cpp: In function 'int main(int, char**)':
main.cpp:7:5: warning: 'auto' changes meaning in C++11; please remove it [-Wc++0x-compat]
     auto p = Posit(5, 1);
     ^
main.cpp:7:10: error: 'p' does not name a type
     auto p = Posit(5, 1);
          ^
main.cpp:9:46: error: 'p' was not declared in this scope
     for (unsigned i = 0; i < (unsigned)(1 << p.nbits()); i++) {
                                              ^
make: *** [main.o] Error 1

[libcg]

Makes sense. Thank you