initial import of LWP-Curl 0.12

git-cpan-module:   LWP-Curl
git-cpan-version:  0.12
git-cpan-authorid: unknown
Use Net::Curl instead of WWW::Curl
Replace WWW::Curl with Net::Curl
Update test suite to use Net::Curl
Update docs / fix post return value
Make sure post keys/values are encoded separately
Merge remote-tracking branch mrallen1/LWP-Curl

Conflicts:
	Changes
	Makefile.PL
	lib/LWP/Curl.pm
	t/default_values.t
	t/error.t
	t/get.t
	t/set_values.t
Test version

With a patch by Mark Allen that changed the default engine:

WWW::Curl -> Net::Curl

I want to make sure that the tests will not fail in others O.S