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Load credentials is now async (#202)

Though it looks like a lot of changes, note that most of it is un-indenting the callbacks that were originally given to `getAPICredentials()`. It is now an `async` function, and any command that uses it has been changed to use `await getAPICredentials()` instead. 

Signed-off-by: campionfellin <campionfellin@gmail.com>

Fixes #201 
- [x] `npm run test` succeeds.
Results:
```
  19 passing (55s)
  4 pending

--------------|----------|----------|----------|----------|-------------------|
File          |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
--------------|----------|----------|----------|----------|-------------------|
All files     |    56.37 |    43.12 |    60.95 |    62.89 |                   |
 clasp        |    96.55 |       50 |      100 |    96.55 |                   |
  index.js    |    96.55 |       50 |      100 |    96.55 |               187 |
 clasp/src    |     53.9 |    47.11 |    59.53 |    59.03 |                   |
  auth.js     |    28.07 |    31.91 |    27.27 |    31.82 |... 39,240,241,245 |
  commands.js |    56.74 |    49.11 |    60.22 |    59.08 |... 05,706,707,733 |
  files.js    |    67.11 |    55.14 |     93.1 |    78.57 |... 82,192,194,197 |
  utils.js    |    60.61 |    48.21 |    67.35 |    70.16 |... 43,268,269,294 |
 clasp/tests  |    61.25 |     9.38 |     66.1 |    72.64 |                   |
  test.js     |    61.25 |     9.38 |     66.1 |    72.64 |... 55,256,257,258 |
--------------|----------|----------|----------|----------|-------------------|
```
- [x] `npm run lint` succeeds.
- [ ] Appropriate changes to README are included in PR.

30 of 491 branches covered (6.11%)

Branch coverage included in aggregate %.

181 of 863 relevant lines covered (20.97%)

7.44 hits per line