Fixed JERSEY-1960.

- Fixed ability to inject request-scoped Servlet components into singleton JAX-RS providers.
- Added integration test.
- Minor unrelated fix: set "project.reporting.outputEncoding" maven property to avoid some build warnings.
- PS: test enhanced + rebased

Change-Id: Ibba668808e50056f846d428cfd3377be342bdb75
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>
Merge "Fixed JERSEY-1960."