bumping to 2.50.1 release, updating changelog

updating java changelog and version number bump for 2.50

py 3.5 on delete doesn't allow new http requests to be made, throws a…

…n exception here

fixes SeleniumHQ#1504

Bump Java to 2.49.0 and update Changelog

updating maven files for httpclient / httpcore update

bumping to 2.48.1

Updating IE driver version for impending 2.48.0 release

Bumping version number for Java 2.47.1 release

Updating version information for 2.47.0 release

Minor nitpick update to Java CHANGELOG