Changes EVA and removes a whole bunch of spacesuits

- All EVA hardsuits are replaced with 6 grey suits
- Remodeled EVA to suit the new contents, get rid of all those fucking
doors making it impossible to get an hardsuit before dying if you don't
have access, fix that fucking maintenance door not being accessible to
anyone and also added vox crew support because why not
- Atmos hardsuits down from 3 to 1
- Engineering hardsuits down from 4 to 2
- Anomaly hardsuits down from 3 to 1
- Security hardsuits down from 3 to 1
- Mining, CE, Excavation, Paramedic and Captain hardsuits left untouched
Merge pull request #971 from Duny-/blame_aurx_and_burnzez

Changes EVA and removes a whole bunch of spacesuits
Add CONTRIBUTING.md
Merge branch 'Bleeding-Edge' of github.com:d3athrow/vgstation13 into Bleeding-Edge