Makefile: add output.{cho} to UT build
README: add description of output.{cho} to file listing
README: add a sample run of the unit test program dotest
README: add contributors section for licensing / legal reasons
README: add reference of Google Public DNS from UT section
test.c: fix misspelling of 'example.net'
test.c: move UT functions to output.c so others can reuse them
output.{c,h}: add new file for the print functions
Makefile: add output.*.o into library build for others to use
dns.h: add references to req'd system headers
gitignore: filter out build files