Docker: added hooks for main docker images

docker/zesty/Dockerfile

@@ -42,9 +42,11 @@ RUN cd g2o && \
     cd && \
     rm -r g2o
 
-# libpointmatcher
+# libpointmatcher 
 RUN git clone https://github.com/ethz-asl/libnabo.git
+#commit Apr 25 2018
 RUN cd libnabo && \
+    git checkout 7e378f6765393462357b8b74d8dc8c5554542ae6 && \
     mkdir build && \
     cd build && \
     cmake -DCMAKE_BUILD_TYPE=Release .. && \
@@ -53,7 +55,9 @@ RUN cd libnabo && \
     cd && \
     rm -r libnabo
 RUN git clone https://github.com/ethz-asl/libpointmatcher.git
+#commit Jan 19 2018
 RUN cd libpointmatcher && \
+    git checkout 00004bd41e44a1cf8de24ad87e4914760717cbcc && \
     mkdir build && \
     cd build && \
     cmake -DCMAKE_BUILD_TYPE=Release .. && \
@@ -62,7 +66,9 @@ RUN cd libpointmatcher && \
     cd && \
     rm -r libpointmatcher
 
+
 # Clone source code
+ARG CACHE_DATE=2016-01-01
 RUN git clone https://github.com/introlab/rtabmap.git
 
 # Build RTAB-Map project

docker/zesty/hooks/build

@@ -0,0 +1,2 @@
+#!/bin/bash 
+docker build --build-arg CACHE_DATE=$(date) .