add getFeeInfo, getTradeList methods and options for post order methods

[dutu]

• Add options to postBuyOrder, postMarketBuyOrder, postSellOrder and postMarketSellOrder (Missing support for optional parameters for post order methods #20)
• Add getFeeInfo method
• Add getTradeList method
• Add tests to cover all updates
• Update documentation

[bausmeier]

Thanks for the PR. I'll try and find a few minutes to review this over the weekend. Can't promise anything though.

[codecov-io]

Codecov Report

Merging #21 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #21   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          127       154   +27     
=========================================
+ Hits           127       154   +27     

Impacted Files	Coverage Δ
lib/BitX.js	100.00% <100.00%> (ø)

[codecov-commenter]

Codecov Report

Merging #21 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #21   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          127       154   +27     
=========================================
+ Hits           127       154   +27     

Impacted Files	Coverage Δ
lib/BitX.js	100.00% <100.00%> (ø)

[dutu]

Since there were no updates on this pull request I have detached the fork, and there will be no additional requests here.

Forked repository with additional updates is https://github.com/dutu/node-bitx