Fix the linter errors

[pdehaan]

Fixes #76

[pdehaan]

This should get us most of the way there...

Currently, running $ npm run lint:html will give you one error:

$ npm run lint:html

> portal-alpha@1.0.0 lint:html /Users/pdehaan/dev/github/mozilla/something-awesome
> htmllint 'views/*.handlebars'

views/index.handlebars: line 54, col 13, the id "upload-img" is already in use

[htmllint] found 1 errors out of 2 files

And running $ npm run lint:js gives a bunch of warnings. We know we're doing a variable file name and it shouldn't be a security risk, so we can possibly globally disable that rule or do it on a per-instance basis or whatever.

 npm run lint:js

> portal-alpha@1.0.0 lint:js /Users/pdehaan/dev/github/mozilla/something-awesome
> eslint .


/Users/pdehaan/dev/github/mozilla/something-awesome/frontend/src/download.js
  32:9  warning  Unexpected console statement  no-console

/Users/pdehaan/dev/github/mozilla/something-awesome/frontend/src/fileSender.js
  26:11  warning  Unexpected console statement  no-console
  28:11  warning  Unexpected console statement  no-console

/Users/pdehaan/dev/github/mozilla/something-awesome/server/portal_server.js
  32:3  warning  Found fs.exists with non literal argument at index 0
	32:    storage.exists(id).then(doesExist => {  security/detect-non-literal-fs-filename

/Users/pdehaan/dev/github/mozilla/something-awesome/server/storage.js
   61:5   warning  Found fs.exists with non literal argument at index 0
	61:      redis_client.exists(id, (rediserr, reply) => {                                           security/detect-non-literal-fs-filename
   70:15  warning  Found fs.statSync with non literal argument at index 0
	70:        resolve(fs.statSync(path.join(__dirname, '../static', id)).size);                    security/detect-non-literal-fs-filename
   78:10  warning  Found fs.createReadStream with non literal argument at index 0
	78:    return fs.createReadStream(path.join(__dirname, '../static', id));               security/detect-non-literal-fs-filename
   83:21  warning  Found fs.createWriteStream with non literal argument at index 0
	83:      const fstream = fs.createWriteStream(path.join(__dirname, '../static', id));  security/detect-non-literal-fs-filename
  108:17  warning  Found fs.unlinkSync with non literal argument at index 0
	108:          resolve(fs.unlinkSync(path.join(__dirname, '../static', id)));                  security/detect-non-literal-fs-filename
  117:13  warning  Found fs.unlinkSync with non literal argument at index 0
	117:      resolve(fs.unlinkSync(path.join(__dirname, '../static', id)));                      security/detect-non-literal-fs-filename

✖ 10 problems (0 errors, 10 warnings)

r? @dannycoates

[pdehaan]

Filed one outstanding HTMLLint bug as #82 since it may require a bit of refactorizationment.