Swizzle didMoveToWindow() instead of init()

[devxoul]

Fixes #1 and #2

[codecov-io]

Codecov Report

Merging #3 into master will increase coverage by 0.06%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
+ Coverage   96.79%   96.86%   +0.06%     
==========================================
  Files          11       11              
  Lines         406      415       +9     
==========================================
+ Hits          393      402       +9     
  Misses         13       13

Impacted Files	Coverage Δ
Tests/RxReusableTests/DisplayingTests.swift	100% <100%> (ø)	:arrow_up:
Sources/UICollectionView+RxReusable.swift	95.55% <100%> (+0.2%)	:arrow_up:
Sources/UITableView+RxReusable.swift	100% <100%> (ø)	:arrow_up:

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