Added pause/resume, refactored code, improved command line interface, etc

[whitef0x0]

This is a big PR, so let me just list out everything that I've changed/added

New Features

Torrent.js

1. Added pause() & resume() for active torrents
   • pauses and resumes the current torrent
2. Added disableSeeding() and enableSeeding()
   • enables or disables autoseeding

Index.js

1. Added pause() & resume()
   • pauses and resumes a client's torrent (calls Torrent.pause/resume)
2. Added addBySearch()
   • Fetches most relevant torrent from http://kat.cr and downloads first result

bin/test.js

1. Added CLI interface for test running
   • see webtorrent-test --help for more info

bin/cmd.js

1. Added CLI interface for searching
2. Added CLI menu to quit, resume and pause while seeding or downloading a torrent

Testing

test/browserAppendTo

1. Added a browser-based video streaming test for AppendTO

test/Resume-Torrent-Scenarios

1. Added 5 scenario-based test cases for pause and resume (resume-torrent-scenarios.js)

Search-Torrent-Scenarios

1. Added 3 scenario-based test cases for pause and resume (resume-torrent-scenarios.js)

Torrent.js

1. Added unit tests for private functions in Torrent.js

I also added coveralls support and code coverage with istanbul if you choose to use it

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