Merge branch 'develop' of https://github.com/biojs/biojs-backend into develop

Author: Megh-Thakkar

.travis.yml

@@ -0,0 +1,10 @@
+language: python
+
+python:
+  - 2.7
+
+install:
+  - pip install -r requirements.txt
+
+script:
+  - python manage.py migrate

main/admin.py

@@ -2,4 +2,6 @@
 from .models import *
 # Register your models here.
 admin.site.register(Component)
-admin.site.register(Tag)
+admin.site.register(Tag)
+admin.site.register(Contributor)
+admin.site.register(Contribution)