docs: add ’to’ in “how it works”.

fix a typo, changing ‘..sending a signal the testing server to inform..’, into ‘..sending a signal *to* the testing server to inform..’

Closes #980
Merge pull request #981 from MattijsKneppers/fix-small-typo-how-it-works

docs: add ’to’ in “how it works”.
fix(tests) fix line longer that 100 chars in helper.spec.coffee
makes `grunt lint` pass
Merge pull request #996 from sylvain-hamel/fix-coffeelint

fix(tests) fix line longer that 100 chars in helper.spec.coffee
docs(dev): update git commit msg convention
docs(dev): rewrite most of the dev docs