Add support for platform api 0.2

[matthewmcnew]

Signed-off-by: Arjun Sreedharan asreedharan@pivotal.io

[codecov-io]

Codecov Report

Merging #267 into master will increase coverage by 0.75%.
The diff coverage is 97.48%.

@@            Coverage Diff             @@
##           master     #267      +/-   ##
==========================================
+ Coverage   66.09%   66.85%   +0.75%     
==========================================
  Files          76       77       +1     
  Lines        3014     3089      +75     
==========================================
+ Hits         1992     2065      +73     
- Misses        771      775       +4     
+ Partials      251      249       -2

Impacted Files	Coverage Δ
pkg/reconciler/v1alpha1/build/build.go	68.62% <ø> (ø)	⬆️
pkg/cnb/cnb_metadata.go	66.26% <100%> (ø)	⬆️
pkg/buildpod/generator.go	60% <100%> (+0.74%)	⬆️
pkg/apis/build/v1alpha1/build.go	32.6% <20%> (-13.3%)	⬇️
pkg/apis/build/v1alpha1/build_pod.go	97.69% <98.67%> (-0.38%)	⬇️
pkg/apis/experimental/v1alpha1/stack_validation.go	88.88% <0%> (ø)

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[thisisnotashwin]

LGTM