Fix ESLint indentation warnings

[TheDancingCode]

This properly indents the code to fix 300+ ESLint warnings.

Six max-len warnings remain, but they're less straightforward to resolve, so I leave that up to you.

[coveralls]

Coverage remained the same at 99.31% when pulling a21fbee on TheDancingCode:fix-eslint-warnings into a58a58d on adametry:master.

[coveralls]

Coverage remained the same at 99.31% when pulling a21fbee on TheDancingCode:fix-eslint-warnings into a58a58d on adametry:master.

[TheDancingCode]

@adametry
Did you get a chance to look at this?

[Lamisi]

Is this the same error as this:

142:11 error Expected indentation of 12 space characters but found 10 react/jsx-indent
'lint-app' errored after 5.46 s
ESLintError in plugin 'gulp-eslint'

[TheDancingCode]

Not exactly. This PR fixes the same kind of error, but then for the code found in this repo.