feat: nightly builds now available

Nightly builds can now be accessed with branch `nighly`. This contain WIP features that might break
at any time. See the README.md for details on how to access nightly builds.

.travis.yml

@@ -5,4 +5,11 @@ install:
   - npm install
 script:
   - commitlint-travis
+  - npm run build
   - npm run semantic-release
+deploy: 
+  - provider: script
+    skip_cleanup: true
+    script: bash publish-nightly.sh
+    on: 
+      branch: feature/nightly-builds

publish-nightly.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+setup_git() {
+    git config --global user.email "[email protected]"
+    git config --global user.name "Travis CI - Bot"
+}
+
+commit_files() {
+    git add dist -f
+    git commit -m "Update nightly files"
+}
+
+update_nightly_branch() {
+    git remote add origin-nightly https://${GH_TOKEN}@github.com/ashblue/fluid-behavior-tree.git
+    git subtree push --prefix dist origin-nightly nightly
+}
+
+setup_git
+commit_files
+update_nightly_branch