larch: fix copyright years in OptionParser spec.

* bin/larch (parser): s/2104/2014/.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
maint: add a .gitignore file.

* .gitignore: New file.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
optparse: use stdlib 37 optparse instead of our own copy.

* rockspec.conf (dependencies): Add stdlib >= 37.
* lib/larch/optparse.lua: Remove.
* lib/main.lua: Require std.optparse instead of larch.optparse.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>