Declare testing dependency on Test::Mock::Extends
Better destruction of unopened Rserve file handle (fixes #41)

This was indirectly causing unit test "failing undef server" in
io-oo-rserve-eval-mock.t to fail.
Fix failing tests with infinity/NaN (#40)

Based on http://stackoverflow.com/a/1185828
Release version 0.101

Changes since 0.10:

- Fix failing tests involving comparison with infinity/NaN (#40)
- Better handling of unopened server file handle in destructor (#41)
- Declare testing dependency on Test::Mock::Extends