Remove implicit rosbridge float32 -> int cast workaround

[a-stickan]

Description

In #44, we discovered that rosbridge would convert floats of 0.0 to ints of 0 implicitly. This caused a lot of problems, and we implemented some scuffed workarounds to avoid it. The issue we posted in the rosbridge_suite repo has been resolved with the PR here, so it should be safe to remove the workarounds now.

Requirements

• Remove the implicit casting workarounds
• Test that the improved new method works

[a-stickan]

Completed with #91