Revert "Prevent double encoding"

Fixes https://github.com/Atmosphere/atmosphere/issues/1479

This reverts commit 0770b52a8ffd205083e72b7422e958769f74ef7b.

Conflicts:
	modules/cpr/src/main/java/org/atmosphere/client/TrackMessageSizeInterceptor.java

Change-Id: Ifd447664c153f51537c7b7f268d1302c0c1e4d57