Less was removed by mistake during merge

Dockerfile

@@ -37,6 +37,7 @@ RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main" > \
     libxrender1 libxext6 fontconfig \
     python-zsi \
     python-lasso \
+    libzmq3 \
     # libpq-dev is needed to install pg_config which is required by psycopg2
     libpq-dev \
     # These libraries are needed to install the pip modules
@@ -47,6 +48,10 @@ RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main" > \
     libldap2-dev \
     libsasl2-dev \
     libssl-dev \
+    # Librairies required for LESS
+    node-less \
+    nodejs \
+    npm \
     # This library is necessary to upgrade PIL/pillow module
     libjpeg8-dev \
     # Git is required to clone Odoo OCB project
@@ -56,6 +61,10 @@ RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main" > \
 ADD sources/pip-req.txt /opt/sources/pip-req.txt
 RUN pip install -r /opt/sources/pip-req.txt
 
+# Install LESS
+RUN npm install -g less less-plugin-clean-css && \
+  ln -s /usr/bin/nodejs /usr/bin/node
+
 # must unzip this package to make it visible as an odoo external dependency
 RUN easy_install -UZ py3o.template==0.9.11
 RUN easy_install -UZ py3o.types==0.1.1