Migrate ruby-openscap upstream under the /OpenSCAP umbrella.
The named arguments are not omnipresent (1/2)

This is ugly.

Ruby 2.0 allows for named arguments, but these bindings should work
on older Ruby as well. I could create another function and keep API
stable. However, I would end-up maintaining it forever. Or at least
to the era of complete Ruby obsolescence. I choosed to break API.
Primo, that's what hipsters do nowdays. Keeping API stable is emo.
Secondo, this library seems to be used by nobody at this time.

Going forward, I'll be more Emo.
The named arguments are not omnipresent (2/2)
No need to require Ruby 2.0 anymore.
Moving colon.

Addressing:
  NameError: undefined local variable or method `report_file' for #<OpenSCAP::Xccdf::Session:0x00000001b0ba70>
/home/slukasik-f16/data/.hidden/workspace/ruby/ruby-openscap/lib/openscap/xccdf/session.rb:72:in `export_results'
/home/slukasik-f16/data/.hidden/workspace/ruby/ruby-openscap/test/xccdf/session_ds_test.rb:108:in `test_session_export_oval_variables'
tests: Fix for older ruby/rake/unittest.

Addressing:
  1) Failure:
default_test(OpenSCAP::TestCase) [/usr/bin/rake:19]:
No tests were specified.
tests: Older ruby's TestCase does not love to cleanup()

Now the test pass on Red Hat Enterprise Linux 6.

Addressing:
  1) Error:
test_double_read_error(TestOscapVersion):
Errno::ENOENT: No such file or directory - test/output
    ./test/common/testcase.rb:32:in `mkdir'
    ./test/common/testcase.rb:32:in `setup'
ruby-openscap-0.2.0
Introduce OpenSCAP::Source as a binding to oscap_source.
Introduce a simple test for OpenSCAP::Source
OpenSCAP 1.2.x will have different error messages

Addressing:
  1) Failure:
TestSession#test_session_new_bad
[/home/slukasik-f16/data/.hidden/workspace/ruby/ruby-openscap/test/xccdf/session_test.rb:24]:
Message was: failed to load external entity "" [oscap_source.c:151]
Unable to parse XML at: '' [oscap_source.c:152]
Make sure that oscap_init is run before each test case

Addressing:
[13/23] TestSessionDS#test_session_export_html_reportxmlXPathCompOpEval: function node-set not found
XPath error : Unregistered function
runtime error: file /usr/share/openscap/xsl/xccdf-report.xsl line 84 element variable
Failed to evaluate the expression of variable 'last_test_time'.