Persist throttle/debounce arguments

[gmcquistin]

Resolves #2.

I have copied throttle and debounce from the Lodash library and added a line which clones the arguments, so the debounced function will receive a clone of the original arguments. In this way, even if the original caller modifies the arguments after the fact, we will still have a copy.

[codecov-io]

Current coverage is 87.27%

Merging #1 into master will decrease coverage by -12.73% as of c58767c

@@            master      #1   diff @@
======================================
  Files            5       7     +2
  Stmts           30     110    +80
  Branches         5      23    +18
  Methods          0       0       
======================================
+ Hit             30      96    +66
  Partial          0       0       
- Missed           0      14    +14

Review entire Coverage Diff as of c58767c

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[liddellj]

LGTM 👍