Create the targeted element before the script

[rgbkrk]

This doesn't solve the issue with iframe resizing, though it's certainly something that should be done to ensure the element targeted for vega exists.

[dbtsai]

This looks good to me. However, this changes the output HTML which breaks the test. Can you fix it in StaticHTMLRendererSpec? Thanks.

[codecov-io]

Codecov Report

Merging #108 into master will decrease coverage by 29.29%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
- Coverage   70.25%   40.95%   -29.3%     
==========================================
  Files          27       28       +1     
  Lines        1785     3064    +1279     
  Branches        6        3       -3     
==========================================
+ Hits         1254     1255       +1     
- Misses        531     1809    +1278

Impacted Files	Coverage Δ
...c/main/scala/vegas/render/StaticHTMLRenderer.scala	100% <100%> (ø)	:arrow_up:
core/src/main/scala/vegas/spec/Spec.scala	0% <0%> (-69.43%)	:arrow_down:
spec/src/main/scala/vegas/spec/Spec.scala	69.42% <0%> (ø)
...os/src/main/scala/vegas/macros/AliasWithLens.scala	100% <0%> (+100%)	:arrow_up:

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[rgbkrk]

All set, want me to squash this down to one commit?

[dbtsai]

@rgbkrk Thanks for this PR. Merged into master. Github can squash when merging :)