conf_test: Add pacman.conf test files

The testing/conf/ directory was added to contain example pacman.conf for
testing ParseConfig.
Add examples/README.md
Remove useless ctest directory
Add license block to all files
Change imports for examples

Import alpm directly instead of github.com repo.

This breaks the go get command.

When developing applications with go-alpm, one should not use go get to
retrieve the library since minor pacman updates usally include api changes, it
would be a good idea to pin your application to a specific revision of go-alpm.
go get does not provide this functionality, and is useless for this purpose.

See http://nathany.com/go-packages/