Fix NODE_ENV development definition

- Define develop build for development branches.
  - Use POSIX standard to call shell scripts in travis file.

.travis.yml

@@ -27,7 +27,7 @@ before_install:
   # Install truffle
   - yarn global add truffle
 script:
-  - bash ./config/travis/build.sh
+  - ./config/travis/build.sh
 after_success:
   # Pull Request - Deploy it to a review environment
   # Travis doesn't do deploy step with pull requests builds
@@ -69,6 +69,6 @@ deploy:
   on:
     tags: true
 - provider: script
-  script: bash config/travis/prepare_production_deployment.sh
+  script: ./config/travis/prepare_production_deployment.sh
   on:
     tags: true

config/travis/build.sh

@@ -2,7 +2,12 @@
 
 export NODE_ENV=production;
 
-if [[ -n "$TRAVIS_TAG" ]]; then export REACT_APP_ENV='production'; fi
+if [[ -n "$TRAVIS_TAG" ]]; then
+    export REACT_APP_ENV='production';
+elif [[ "$TRAVIS_BRANCH" == "development" ]];
+    export NODE_ENV=development;
+fi
+
 
 yarn lint:check
 yarn prettier:check