Adding Abdullah Haroon + fixing missing URLs

@ahrasheed thank you for
https://github.com/openworm/CElegansNeuroML/pull/19
Adding Alexander N

@Alexander-N thank you for this:
https://github.com/openworm/org.openworm.website/pull/50
Adding Christina Lee

@albi3ro thanks for
https://github.com/openworm/Smoothed-Particle-Hydrodynamics/pull/58
Adding Nathan Daly

@NHDaly thanks for this:
https://github.com/openworm/Smoothed-Particle-Hydrodynamics/pull/43
Adding credentiality

thanks @credentiality for this:
https://github.com/openworm/Smoothed-Particle-Hydrodynamics/pull/17
Adding Christopher Perez

thanks @leptonverde for this:
https://github.com/openworm/Smoothed-Particle-Hydrodynamics/pull/13
Adding Rick Gerkin

Thanks @rgerkin for this:
https://github.com/openworm/movement_validation/pull/85
Adding Phil McElmurray

thanks @pm1988 for this:
https://github.com/openworm/movement_validation/pull/95
Adding Ari Richman

thanks @aribrich for this:
https://github.com/openworm/OpenWorm/issues/212#issuecomment-57058652
Adding Dominic Denicola

thanks @dominic for this:
https://github.com/openworm/org.geppetto.frontend/pull/199
Adding Dan Kruchinin

Thanks @dkruchinin for this:
https://github.com/openworm/org.geppetto.frontend/pull/165
Adding Martin Madaras

thanks @gitmado for this: https://github.com/openworm/skeletonExtraction