- Also use Phing for Swagger-UI installation for better cross-platform support.

Add a Contributing section linking to the wiki

* removed vendor from .gitignore
* updated and added dependencies in vendor folder

- Adjusted wiki links to point to latest URLs.
- Removed VuFind2 category name (use generic VuFind instead).

* fixed typo
* commit-emails should work now

A combined, slightly modified version of the changes to README.md from:

* eac50fca 2014-11-03 | added dev-dependencies to add ci-tools via composer [Ulf Seltmann]
* 12e3f23c 2014-10-14 | * reverted vendor to vufind.org state * added composer.phar * updated all dependencies from composer.json [Ulf Seltmann]
* 729ff5e3 2014-09-11 | modified docu [smoebody]

See https://github.com/vufind-org/vufind for more details.