v0.7.0

Main changes in this release:

• New library-inspecific HTTP client design. See commit ec88e60 for more.
• HTTP logging is disabled by default
• JrawUtils methods renamed. See commit 0ce88cd for more.
• Switch to Guava's MediaType instead of OkHttp's
• Migrated to Jackson 2
• Removed Votable's getUpvotes() and getDownvotes(). See commit 0c81a0e