Use BINTRAY_USER everywhere

Was trying to test the travis integration and came across this

.ci/bintray-release.json

@@ -12,7 +12,7 @@
       "GPL-3.0"
     ],
     "name": "Seaglass",
-    "subject": "neilalexander",
+    "subject": "BINTRAY_USER",
     "repo": "Seaglass",
     "public_download_numbers": true,
     "public_stats": true,

.travis.yml

@@ -15,6 +15,7 @@ script:
 before_deploy:
   - cd build && tar -zcf Seaglass-$(cd $TRAVIS_BUILD_DIR && sh scripts/version.sh).tar.gz Seaglass.app && cd ..
   - sed -i -e "s/VERSION_NAME_VALUE/$(cd $TRAVIS_BUILD_DIR && sh scripts/version.sh)/g" .ci/bintray-release.json
+  - sed -i -e "s/BINTRAY_USER/$BINTRAY_USER/g" .ci/bintray-release.json
 deploy:
   - provider: bintray
     file: .ci/bintray-release.json