Bumped version to 0.9.1 and updated NEWS file
Exclude two hidden files from releases

The license header file and the Travis CI configuration file are not
relevant in source releases.
Updated copyright year in Info.plist file
A few minor Windows installer updates

* Allow specifying a build directory separate from the repository root
* Take the compiled translations from the build directory
* Install LICENSE.APACHE.txt, which covers one of the plugins
* Don't try to delete no longer existing LICENSE.LGPL.txt
* Commented out MinGW dlls since I'm using VS 2010 Express now
Merge branch '0.9'