[EDIT] Use bcrypt-node instead of C++ bcrypt

[TareqElMasriDev]

I had an issue in my server caused by missing GCC library called GLIBCXX_3.4.21.
That was needed by bcrypt library.

I just replaced bcrypt with its native javascript alternative "bcrypt-node"
That will save time to a lot of people

[coveralls]

Coverage remained the same at 37.313% when pulling 16cad15 on TareqElMasri:fix_glibcxx_issue into 5ac2f15 on waterlock:master.