Ubuntu build: wrong compiler settings

[sasmaster]

Hi.Thanks for the awesome lib. However, on Linux (Ubuntu 16.04, G++ 6.3.0) there are 2 issues:

1. Compiler flags -pg and -fomit-frame-pointer can't live together (compiler error)

2. crn_vector.cpp lines 25/26: size_t must be explicitly cast to uint64.

[illwieckz]

2nd error may have been fixed in #25.