Lot has been deprecated in Rake so we need to install things like
RDoc.

Also prepare the ground for usage of rake-compiler.

Move things out of root of the gem to avoid things like:

  require "extconf"

Messing things up

Once extension is compiled it will be moved by RubyGems to lib
directory, so there is no need to indicate "." be added to the
$LOAD_PATH

This resolves the deprecation warning caused by usage of old rake.

Instead of duplicated gemspec to maintain, load the spec from the
file.

This solve deprecation warnings and also ensure gems get properly
packaged.

This opens the door for cleaner compilation and later add cross
compilation support.

Without it, Ruby 1.9.x can't read the test file.

Rake::TestTask automatically adds 'lib' directory to $LOAD_PATH.

Clobber the data files from 'data' when requested.

Also ignore data directory from Git.

Since test already depends on compile

And rename it to match the module it is testing.

For some country+region combos, region_name might not be found, which
results in a NULL string and causes segfault when strlen() is performed
on it.