:gb: Added constructor documentation
:gb: Added update(delta, index) documentation
:gb: Added error checking for compatible particle component sizes
:gb: Created SpringSpec
:gb: Added unique identifier
:gb: Added p1 and p2 error checking
:gb: Added length error checking
:gb: Added length and stiffness values to Spring instances
:gb: Implemented length error checking and test suite
:gb: Added stiffness error checking and test suite
:gb: Added p1 and p2 getters and setters
:gb: Added p1 and p2 test suite
:gb: Added length setter and getter with test suite
:gb: Added stiffness setter and getter with test suite
:gb: Added constructor.__uid test suite
:gb: Added id test suite
:gb: Added __vector object reference and test suite
:gb: Added __delta and __slave worker vectors and implemented test suite
:gb: Implemented update(delta, index) and apply(particle, force)