Simplified AJAX autocomplete method; moved array_values() into factory for more consistent central behavior (this may not be necessary, but retaining it as a safety mechanism to prevent badly encoded output caused by associative arrays).

Progress on upgrade process -- added config processing, added missing routes, fixed text in success template.

Cleaned up docblocks (mostly @return statements, mostly reflecting the fact that ZF2 controller actions are no longer void).

Finished updating install controller; MySQL database creation now works.  Updated AdapterFactory to be more flexible (no longer forced to depend on existing configuration).

Made use of config writer more consistent; rather than having unrelated static and non-static methods, the writer now acts as an integrated object.

Refactored code using serverurl view helper; there are still a couple of stand-alone invocations of the helper, but now the majority run through a public getServerUrl method in the base controller, which makes it easier to change this behavior if a more elegant mechanism becomes available in the future.

Created forwardTo() convenience method in base controller to make forward actions less verbose than using the forward() plugin directly.

Corrected inappropriate use of forward() helper (no need to return the output of dispatch method); this solved some strange flash messenger behavior that was caused by duplicate view models being attached to the layout.

Explicitly hide COinS for better LibX compatibility (LibX makes COinS visible, which garbles VuFind displays).