feat(release): replace semantic-release dep with Travis build stages

This makes CI quicker, and releases more stable.

Connects pelias/api#1187

Author: orangejulius

Diff for: .travis.yml

@@ -1,21 +1,22 @@
 sudo: false
 language: node_js
-cache:
-  directories:
-    - node_modules
 notifications:
   email: false
 node_js:
   - 6
   - 8
   - 10
 matrix:
-    fast_finish: true
+  fast_finish: true
 script: npm run travis
 before_install:
   - npm i -g npm
-after_success:
-  - npx semantic-release
 branches:
   except:
     - /^v\d+\.\d+\.\d+$/
+jobs:
+  include:
+    - stage: release
+      node_js: 10
+      script: curl "https://raw.githubusercontent.com/pelias/ci-tools/master/semantic-release.sh" | bash -
+      if: branch = master

Diff for: package.json

@@ -25,7 +25,6 @@
     "express": "^4.15.2",
     "pelias-mock-logger": "^1.3.0",
     "proxyquire": "^2.0.0",
-    "semantic-release": "^15.4.1",
     "tap-dot": "^2.0.0",
     "tape": "^4.6.3"
   },