include <unistd.h> exists in Xcode. Include in main().
implemented getopt parsing of command-line switches
Added some additional declarations to clean up warnings identified by AppCode
ignore AppCode directory and files
Merge commit '23a75cbd19db9fc5b2162a1975deafd7f01c66e0' into argv
resolved compiler warnings by prototyping the friend functions properly
added command-line strings
ignore AppCode debug presets in .gitignore
Merge branch 'argv' into develop