Add prototype to &File::chmod::chmod to match &CORE::chmod.  This quiets warning when autodie pragma is used with File::chmod on perl v5.14+.  Add "use autodie;" to tests to verify it works.

fixe GH #3

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>
add a CONTRIBUTING file

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>
remove all UMASK deprecation notices

apparentl GNU chmod at least obey's umask, I'm stupid and thus removing plans
to deprecate

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>
v0.40

	- fix prototype mismatch with chmod() when autodie is used. GH #3 (arrestee)
	[DEPRECATIONS]
	- undeprecating the default of $UMASK is true
	  tested against my local chmod and it does obey umask. This will no
	  longer be removed.