Do not capitalize page titles when importing dump

Capitalization of titles led to duplicates in SQL key for namespace and title if a corresponding upper-case title was already contained in the dump. This is most probably also the source of the duplicate key problem mentioned in #221.

An excerpt from the German Wikipedia dump which triggers this error is available at: https://gist.github.com/dfleischhacker/5f883e45e9afba4e5ec4
since you are splitting with max 2 parts, `(parts.length > 1)' is misleading.
Can you change it to `(parts.length == 2)`?