fix(teats): Use execute to clear browser state
chore(build): remove nsp-task from production
chore(travis): remove env from Travis
Merge pull request #1573 from vladikoff/devDepNSP

chore(build): remove nsp-task from production
Merge pull request #1574 from vladikoff/travisEnv

chore(travis): remove env from Travis
Update CONTRIBUTING.md

Update CONTRIBUTING.md to include more detail on rules around contributing and code reviews.
Add MPL 2.0 license file.
Merge pull request #1575 from mozilla/add-license

Add MPL 2.0 license file.
Update CONTRIBUTING.md
Merge pull request #1571 from vladikoff/executeClearState

fix(teats): Use execute to clear browser state
chore(l10n): update string templates
Merge pull request #1577 from mozilla/train-20-string-templates

chore(l10n): update string templates. r=vladikoff
tests(login): signin and signup tests for about:accounts