- Pulled in, ported and extended code Reto's code from Clerezza to parse accept headers;
- added method to HttpRequestEntity interface to provide access to accept headers;
- added accompanying unit tests to verify it all works.
- Add missing license header;
- minor cosmetic changes.
Add support and accompanying tests for multiple accept headers.
Add support and accompanying tests for multiple accept headers.
Merge branch 'master' of https://github.com/gmega/p3-transformer-library

Conflicts:
	src/main/java/eu/fusepool/p3/transformer/HttpRequestEntity.java
	src/main/java/eu/fusepool/p3/transformer/util/AcceptHeader.java
	src/test/java/eu/fusepool/p3/transformer/util/AcceptHeaderTest.java
Merge branch 'master' of https://github.com/fusepoolP3/p3-transformer-library
Reviewed #10: Focusing on the total AcceptPreference rather than individual headers
Merge branch 'gmega-master' with pull request #10