Update appveyor configuration:
Update appveyor configuration:

* Test all branches
* Test all features

gwenn/rusqlite,mikelodder7/rusqlcipher,mikelodder7/rusqlcipher,xinghun92/rusqlite,jgallagher/rusqlite,gwenn/rusqlite,xinghun92/rusqlite,gwenn/rusqlite,jgallagher/rusqlite,jgallagher/rusqlite,mikelodder7/rusqlcipher,xinghun92/rusqlite