Replace builtin hash with MD5 to solve 32/64-bit issues.
Replace builtin hash with MD5 to solve 32/64-bit issues.

It seems that Python's builtin hash returns different
values on 32-bit and 64-bit architectures, so it's
safer to use a well-defined hash like MD5.

bug 1050359

Change-Id: Ibb49f7b9028085d2aedaf05b94e1e1dcdf5e4cb4

n0ano/gantt,n0ano/gantt