replace POpen4 with a Tempfile - thus making it compatible with JRuby (tested on Linux with JRuby 1.6.0)
and we do not need the transfer method anymore ...
make sure Tempfile gets deleted/unlinked
add README.rdoc to gemspec for license information

README.rdoc contains the license information. Let's include that
file in the gem so that license information is also installed.
add license information into gemspec

this way this we can get this info when using the rubygems.org API
Merge pull request #29 from jordimassaguerpla/master

add license information to the gem
bump version references to 0.10.0
Merge remote-tracking branch 'kares/master'

Conflicts:
	README.rdoc
add windows compatibility

tested with the following environments:
* jruby 1.7.3 (1.9.3p385) 2013-02-21 dac429b on OpenJDK 64-Bit Server VM 1.7.0_21-b02 [linux-amd64]
* jruby 1.7.4 (1.9.3p392) 2013-05-16 2390d3b on Java HotSpot(TM) Client VM 1.7.0_21-b11 [Windows XP-x86]
* rubinius 2.0.0rc1 (1.8.7 release 2012-11-02 JI) [x86_64-unknown-linux-gnu]
* ruby 1.8.7 (2011-02-18 patchlevel 334) [x86_64-linux], MBARI 0x6770, Ruby Enterprise Edition 2011.03
* ruby 1.8.7 (2012-02-08 MBARI 8/0x6770 on patchlevel 358) [x86_64-linux], MBARI 0x6770, Ruby Enterprise Edition 2012.02
* ruby 1.8.7 (2012-10-12 patchlevel 371) [i386-mingw32]
* ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-linux]
* ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]
* ruby 1.9.3p429 (2013-05-15) [i386-mingw32]
* ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]
* ruby 2.0.0p247 (2013-06-27) [i386-mingw32]