Add text style transfer (#166)

[swapnull7]

• initial commit

• bug fixes and adjusting conv inputs

• separate forward function for Discriminator and Generator and disable Gen training for debugging

• remove debugger statement

• texar bug fix

• detaching stuff before accumulating

• refactor and add component as optional parameter

• Add optimizer for and backprop against encoder

• Add in README

[codecov[bot]]

Codecov Report

Merging #263 into master will decrease coverage by 0.04%. The diff coverage is 42.10%.

@@            Coverage Diff             @@
##           master     #263      +/-   ##
==========================================
- Coverage   82.53%   82.48%   -0.05%     
==========================================
  Files         205      206       +1     
  Lines       15829    15848      +19     
==========================================
+ Hits        13064    13072       +8     
- Misses       2765     2776      +11     

Impacted Files	Coverage Δ
texar/torch/utils/variables.py	38.88% <38.88%> (ø)
texar/torch/utils/__init__.py	100.00% <100.00%> (ø)

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[gpengzhi]

Please merge master into your branch to pass the codecov test.

[huzecong]

You might also want to change the PR title; should reference #166 instead.