Added forward_features inside Estimator class of Adanet.

[chamorajg]

Added forward_features function inside estimator class to use tensorflow's forward_features inside adanet. Closes #114 @cweill

[codecov-io]

Codecov Report

Merging #119 into master will decrease coverage by 0.11%.
The diff coverage is 20%.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
- Coverage   88.94%   88.82%   -0.12%     
==========================================
  Files          31       31              
  Lines        3011     3016       +5     
  Branches      475      476       +1     
==========================================
+ Hits         2678     2679       +1     
- Misses        244      248       +4     
  Partials       89       89

Impacted Files	Coverage Δ
adanet/core/estimator.py	90.68% <20%> (-0.62%)	⬇️

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Codecov Report

❌ Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.82%. Comparing base (88daf39) to head (f03fe72).
⚠️ Report is 107 commits behind head on master.

Files with missing lines	Patch %	Lines
adanet/core/estimator.py	20.00%	4 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
- Coverage   88.94%   88.82%   -0.12%     
==========================================
  Files          31       31              
  Lines        3011     3016       +5     
  Branches      475      476       +1     
==========================================
+ Hits         2678     2679       +1     
- Misses        244      248       +4     
  Partials       89       89              

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