Feature/254 batch actions

[printharsh]

Description

Allows batch actions (hacker status updates and sending emails) for a search query provided.

Currently, updateStatus only works for hacker models, change name to updateHackerStatuses and sendEmailsToHackers?

Fixes #254 #276

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [ ] This change requires a documentation update

How Has This Been Tested?

Tested manually with queries of hackers.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[pierreTklein]

• This requires a documentation change, so run npm run docs or something of that sort.
• Make sure to write a few test calls to your API!

[pierreTklein]

Any updates on this PR?

[loreina]

@pierreTklein backlogged for now