add drone and tox

.drone.yml

@@ -0,0 +1,57 @@
+clone:
+    hg:
+        image: plugins/hg
+
+pipeline:
+    tox:
+        image: ${IMAGE}
+        environment:
+            - CFLAGS=-O0
+            - DB_CACHE=/cache
+            - TOX_TESTENV_PASSENV=CFLAGS DB_CACHE
+            - POSTGRESQL_URI=postgresql://postgres@postgresql:5432/
+        commands:
+            - pip install tox
+            - tox -e "${TOXENV}-${DATABASE}"
+    notify:
+        image: drillster/drone-email
+        from: drone@localhost
+        host: smtp
+        port: 25
+        skip_verify: true
+        when:
+            status: [ changed, failure ]
+
+services:
+    postgresql:
+        image: postgres
+        when:
+            matrix:
+                DATABASE: postgresql
+
+matrix:
+    include:
+        - IMAGE: python:2.7
+          TOXENV: py27
+          DATABASE: sqlite
+        - IMAGE: python:2.7
+          TOXENV: py27
+          DATABASE: postgresql
+        - IMAGE: python:3.4
+          TOXENV: py34
+          DATABASE: sqlite
+        - IMAGE: python:3.4
+          TOXENV: py34
+          DATABASE: postgresql
+        - IMAGE: python:3.5
+          TOXENV: py35
+          DATABASE: sqlite
+        - IMAGE: python:3.5
+          TOXENV: py35
+          DATABASE: postgresql
+        - IMAGE: python:3.6
+          TOXENV: py36
+          DATABASE: sqlite
+        - IMAGE: python:3.6
+          TOXENV: py36
+          DATABASE: postgresql

tox.ini

@@ -0,0 +1,15 @@
+[tox]
+envlist = {py27,py34,py35,py36}-{sqlite,postgresql},pypy-{sqlite,postgresql}
+
+[testenv]
+commands = {envpython} setup.py test
+deps =
+    {py27,py34,py35,py36}-postgresql: psycopg2 >= 2.5
+    pypy-postgresql: psycopg2cffi >= 2.5
+    sqlite: sqlitebck
+setenv =
+    sqlite: TRYTOND_DATABASE_URI={env:SQLITE_URI:sqlite://}
+    postgresql: TRYTOND_DATABASE_URI={env:POSTGRESQL_URI:postgresql://}
+    sqlite: DB_NAME={env:SQLITE_NAME::memory:}
+    postgresql: DB_NAME={env:POSTGRESQL_NAME:test}
+install_command = pip install --pre --process-dependency-links {opts} {packages}