Add feature/comment options

[bxute]

Applying this PR:

• SDK can set beneficiaries to a post.
• Set Percentage of SBD or STEEM Power in payout.

[codecov-io]

Codecov Report

Merging #30 into master will increase coverage by 0.29%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master     #30      +/-   ##
===========================================
+ Coverage     90.31%   90.6%   +0.29%     
- Complexity       59      62       +3     
===========================================
  Files             8       9       +1     
  Lines           289     298       +9     
  Branches         21      21              
===========================================
+ Hits            261     270       +9     
  Misses           19      19              
  Partials          9       9

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/hapramp/steemconnect4j/StringUtils.java	97.05% <100%> (+0.18%)	13 <1> (+1)	⬆️
.../java/com/hapramp/steemconnect4j/SteemConnect.java	91.05% <100%> (+0.09%)	22 <0> (ø)	⬇️
...n/java/com/hapramp/steemconnect4j/Beneficiary.java	100% <100%> (ø)	2 <2> (?)

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