3.0.0-alpha.3

 * 3.0.0-alpha.3 (Miroslav Bajtoš)
 * common: add KeyValueModel (Miroslav Bajtoš)
 * Globalize current-context error messages (Miroslav Bajtoš)
 * Remove current-context API (Miroslav Bajtoš)
 * Fix forceId in tests (jannyHou)
 * test: increase timeout to prevent CI failures (Miroslav Bajtoš)
 * Update globalization string (Candy)
 * Update globalization (Candy)
 * Add globalization (Candy)
 * test: fix "socket hang up" error in app.test (Miroslav Bajtoš)
 * test: increate timeout in Role test (Miroslav Bajtoš)
 * test: make status test more robust (Miroslav Bajtoš)
 * test: fix broken Role tests (Miroslav Bajtoš)
 * Update dependencies to their latest versions (Miroslav Bajtoš)
 * Increase timeout (jannyHou)
 * test: fix change-tracking setup (Miroslav Bajtoš)
 * test: use local registry in test fixtures (Miroslav Bajtoš)
 * Update loopback.js (Rand McKinney)
 * Fix test case error (Loay)
 * Update user.js (Loay)
 * Fix security issue 580 (Loay)
 * Update URLs in CONTRIBUTING.md (#2503) (Ryan Graham)
 * Remove legacyExplorer (gunjpan)
 * Remove `rectifyAllChanges` and `rectifyChange` (Candy)
 * Fix verificationToken bug (Loay)
 * update express version (Loay)
 * Cleanup unit-test added in 1fc51d129 (Miroslav Bajtoš)
 * update errorHandler template (Loay)
