Nearly all other libraries we link to is via static linkage (boost, k1 lib, llvm/clang, etc) so this one should follow suit. Otherwise users would still need to install it when using a binary package. Plus with at least a stock F27 it didn't "just work" after a make install for me.

Added missing change directory command to Linux clean install

The script `build.sh` requires an argument. On linux, the argument is `ubuntu` and on macOS it is `darwin`.

Amazon Linux: Added instructions for installing MongoDB and mongo-cxx-driver to manual installation of dependencies section of README.md

Centos: added build instructions to READMD.md for building mongoDB and mongo-cxx-driver to manual installation of dependencies section for Centos.

Some versions of git do not permit --recurse-submodules on the checkout command so this switches to adding a git submodule update --recursive command instead.  Also cleans up some whitespace to be more consistent.

Signed-off-by: NJoel <you@example.com>

Clarify account.

minor correction in linux build scripts to accomodate small disk sizes that return float when running df -h

added new link to manual dependency install for amazon linux to table of contents, rearranged table of contents in readme.md