Add tests for empty positional and for positional defaults

Update README.md

Merge pull request #104 from akamensky/fix-subcommand-error-reporting

When subcommand must be present but not provided the error must be triggered

Add helper method to check if file descriptor has been initialized wi…

…th data (#89)

Arg can return the result pointer (#84)

* Arg interface can return result pointer

* Arg interface can return result pointer

* Add examples & documentation

* add docstring

Co-authored-by: verburgs <[email protected]>
Co-authored-by: vsachs <[email protected]>

sub-command-help (#72)

* Saving

* Saving

* Updated to use help first in subcommands

* Updated tests for more coverage

* More testing updates

* Updated tests

Co-authored-by: jackh <[email protected]>

add a boolean flag to message2string which indicates if the result st…

…ring is ready to be returned + add tests (#60)

Custom help (#50)

* Finishes addressing issue #29

Adds a Settings struct for creating parsers/commands with
NewParserWithSettings or NewCommandWithSettings.

Settings
	HelpDisabled -	defaults false, set true to not generate a help
			argument for parser/command
	HelpSname -	short name for the parser/command help argument.
			Can be left empty
	HelpLname -	long name for the parser/command help argument.
			Leaving empty forces use of -h/--help when
			HelpDisabled is false
	NoExitOnHelp -	defaults false, set true to not exit on help
			argument being parsed

Should resolve all outstanding help argument issues.

* Finishing Issue #29

Fixed merge conflict error due to check function return type change confusion.

* Updated Settings Object to multiple function calls

Added functions:
	DisableHelp
	SetHelp
	ExitOnHelp

Added Command.exitOnHelp

Added more tests to increase code coverage

* Updated no help example

Fix coveralls link (#49)

Move to go modules