Merge pull request #9 from hanskr/master

Avoid "org.apache.http.ProtocolException: Content-Length header already present" exception
Update readme
Update readme
[maven-release-plugin] prepare release httpcache4j-4.0-M4
[maven-release-plugin] prepare for next development iteration
Merge pull request #10 from hanskr/261c57cd462f359321659a1b8671f5c63cdf16bd

Improvement on the previous pull request
Merge pull request #11 from hanskr/master

Testcase for Content-Length header problems
[maven-release-plugin] prepare release httpcache4j-4.0-M5
[maven-release-plugin] prepare for next development iteration
Update readme
Update readme
Support end-to-end-reload when client sets cache directive 'Cache-Control: no-cache'.
Fix code style.
Add test for end-to-end-reload using 'Cache-Control: cache-none'
Merge pull request #12 from stighenriksen/end-to-end-reload-fix

Support end-to-end-reload using 'Cache-Contro...
Simplification
Removed deprecated methods.
Made execute(request, boolean) private, which should have never been part of the public api.