Adds a wait option for results.

[Koed00]

Adds an optional wait time for result in milliseconds to result() and fetch()

[codecov-io]

Current coverage is 95.24%

Merging #68 into master will increase coverage by +0.04% as of d783b3d

@@            master     #68   diff @@
======================================
  Files           36      36       
  Stmts         2022    2042    +20
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit           1925    1945    +20
  Partial          0       0       
  Missed          97      97       

Review entire Coverage Diff as of d783b3d

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