Release 1.0.0

Todo:

 - [ ] Validation for Support branches bug #149 
 - [ ] GitVersion should match GitFlow docs enhancement up-for-grabs #122 
    - [ ] Patch
    - [ ] Hotfix
    - [ ] Major
 - [ ] [RFC] Should those tests actually pass? question #83 

Add anything else which needs to be done to this list, target PR's at this branch