Fix getAPICredentials so it looks in local RC first then global RC

[campionfellin]

Now, rather than passing a boolean to getAPICredentials of whether you're using local RC, it'll just check there first before moving up to the home dir.

clasp run was the only place it actually passed true, the rest of the commands use nothing (false) and thus is why they didn't pick up on a local RC file.

This will also probably help with testing as well, using Travis with encrypted creds.

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

Closes #131

• npm run test succeeds. (both using clasp login and clasp login --ownkey
• npm run lint succeeds.
• Appropriate changes to README are included in PR.

[coveralls]

Pull Request Test Coverage Report for Build 162

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 19 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 14.082%

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Files with Coverage Reduction	New Missed Lines	%
src/auth.js	19	24.07%

Totals
Change from base Build 161:	0.0%
Covered Lines:	163
Relevant Lines:	889

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💛 - Coveralls

[grant]

Great! Never liked that dangling true.
We support this style eventually:

const localRC = await DOTFILE.RC_LOCAL.read();