Cleanup Makefile
Ignore all files in the ebin directory
Fix #6 and #7: wrap lines in usage output and add default arguments
Fix usage output when a long option has a length that is bigger than a console line
Add example with very long help text to show wrapped usage output
Update version to 0.6.0
The maximum width for the usage output is now 75 characters
Modify example to add a very long suffix to the command line
Fix line wrapping of usage output when the command line suffix is long
Update version to 0.7.0