fix SQLITE_CANTOPEN error when cached.Database is called with absolute path on windows
use path.resolve for getting absolute path

update bundled libsqlite3 from 3080200 -> 3080403

update node-webkit building instructions to reflect new, simplified usage via node-pre-gyp - refs #261

make sqlite3 library name configurable - enabling support for linking to sqlite3 variants like SQLCipher - refs #195

Build node-sqlite3 for node-webkit on Travis CI

The following `npm install` takes more than 3 seconds anyway; `xvfb` would already start before it becomes necessary for node-webkit.

Two packages not found → removing.

Found in “Search the contents of packages” at http://packages.ubuntu.com/ using “lucid” distribution (instead of default “saucy”).

This commit runs one `sudo apt-get -y install` for every package; otherwise each failure stops the whole installation process, but that makes the debugging painful (a test takes 13 minutes to run).