[bug] Fix weapp uuid error.

[onerain88]

In weapp, crypto is not provided.
So, I fake it with random string for installation id.

[davimacedo]

It makes sense to me. What do you think @dplewis ?

[dplewis]

The uuid module is used in other places besides the InstallationController. I think a separate uuid.js file would suffice.

[onerain88]

I wrapped the uuid.js instead of uuid/v4

[codecov]

Codecov Report

Merging #1356 (e69107c) into master (66878f2) will decrease coverage by 0.13%.
The diff coverage is 52.94%.

❗ Current head e69107c differs from pull request most recent head 49d0eb4. Consider uploading reports for the commit 49d0eb4 to get more accurate results

@@            Coverage Diff             @@
##           master    #1356      +/-   ##
==========================================
- Coverage   99.23%   99.10%   -0.14%     
==========================================
  Files          60       61       +1     
  Lines        5920     5933      +13     
  Branches     1346     1347       +1     
==========================================
+ Hits         5875     5880       +5     
- Misses         44       52       +8     
  Partials        1        1              

Impacted Files	Coverage Δ
src/uuid.js	38.46% <38.46%> (ø)
src/AnonymousUtils.js	100.00% <100.00%> (ø)
src/InstallationController.js	100.00% <100.00%> (ø)
src/ParseObject.js	99.89% <100.00%> (ø)
src/RESTController.js	100.00% <100.00%> (ø)

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[dplewis]

LGTM!