Git support for SQLite files

[tracend]

Although a bit out of scope for the project, SQLite DB files don't automatically merge in Git repos.

The proposed process is that .sqlite files are excluded from the website's regular commits - generally mixing data between development and production is not advised anyhow.

Despite that, technically the way to do this is described here:
http://stackoverflow.com/a/3409340

For the sake of providing this as an option, even if it won't be used by the majority of the users, it may be a consideration to include a .gitattributes that dictates how .sqlite files are treated.