srf10_controller.cpp: replace deprecated set_XXX_size calls

The ``set_XXX_size``-style methods are deprecated and have been
completely removed in hydro. Replace them with calls to ``resize`` as
recommended in the migration notes[1].

[1] http://wiki.ros.org/fuerte/Migration
servos.cpp: fix no-return statement warning

Add a return statement to DynamixelServo::servoTorqueEnable which was
missing one.
Merge branch 'replace-deprecated-resize'
Merge branch 'no-return-statement-fix'