Change label to passBackObject and make lastFilledSegment part of metaData

[jkhusanov]

• Changed label to passBackObject. Now consumers can pass any object that they want to receive back.
• Also made lastFilledSegment part of metaData object. These should wrap up everything we talked about.

[codecov[bot]]

Codecov Report

Merging #8 (984ca50) into development (91cd3e2) will not change coverage. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development       #8   +/-   ##
============================================
  Coverage        89.40%   89.40%           
============================================
  Files                5        5           
  Lines              151      151           
  Branches            48       48           
============================================
  Hits               135      135           
  Misses              16       16           

Impacted Files	Coverage Δ
src/SegmentedArc.js	94.66% <100.00%> (ø)

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[jkhusanov]

@chaceburnette agreed, changed it to data