requirements: bump versions

backend/requirements.txt

@@ -1,49 +1,49 b''
 repoze.sendmail==4.1
 pyramid==1.7.3
 pyramid_tm==0.12
 pyramid_debugtoolbar
 pyramid_authstack==1.0.1
 SQLAlchemy==1.0.12
-alembic==0.8.6
+alembic==1.0.8
 webhelpers2==2.0
 transaction==1.4.3
 zope.sqlalchemy==0.7.6
 pyramid_mailer==0.14.1
 redis==2.10.5
 redlock-py==1.0.8
 pyramid_jinja2==2.6.2
-psycopg2==2.6.1
+psycopg2==2.7.7
 wtforms==2.1
 celery==3.1.23
 formencode==1.3.0
 psutil==2.1.2
-ziggurat_foundations>=0.6.7
-bcrypt==2.0.0
+ziggurat_foundations==0.6.8
+bcrypt==3.1.6
 appenlight_client
 markdown==2.5
-colander==1.2
-defusedxml==0.4.1
+colander==1.7
+defusedxml==0.5.0
 dogpile.cache==0.5.7
 pyramid_redis_sessions==1.0.1
 simplejson==3.8.2
 waitress==1.0
 gunicorn==19.9.0
 requests==2.20.0
 requests_oauthlib==0.6.1
 gevent==1.1.1
 gevent-websocket==0.9.5
 pygments==2.1.3
-lxml==3.6.0
+lxml==4.3.2
 paginate==0.5.4
 paginate-sqlalchemy==0.2.0
 pyelasticsearch==1.4
 six==1.9.0
 mock==1.0.1
 itsdangerous==1.1.0
 camplight==0.9.6
 jira==1.0.7
 python-dateutil==2.5.3
 authomatic==0.1.0.post1
-cryptography==1.2.3
+cryptography==2.6.1
 webassets==0.11.1