Merge pull request #1 from robertrolandorg/master

Adding a test for the sqlite-open-v2 method
Have a proper clean target in the Makefile.
Comment out tests for sqlite3-stmt-busy, which isn't available on Ubuntu 12.04.
Merge pull request #2 from cgay/stmt-busy

Comment out tests for sqlite3-stmt-busy, which isn't available on Ubuntu 12.04