Replaced commons-logging with jcl-over-slf4j.
Fixed #169 https://github.com/helun/Ektorp/issues/169
just to trigger Travis CI build
added some unit tests on AndroidHttpClient
AndroidHttpClient should extends StdHttpClient to avoid code duplication, fixes issue #145
anticipating FindBugs warning : fixed reliance on default encoding
Merge pull request #150 from YannRobert/AndroidHttpClientRefactoring

Android http client refactoring fixing issue #145