Merge branch '0.12.0'

Dockerfile

@@ -19,17 +19,14 @@ RUN cd /usr/local/src/bitcoin && \
     git checkout $BITCOIND_REV && \
     ./autogen.sh && \
     ./configure --disable-wallet --enable-hardening && \
-    make -j10 && \
+    make -j2 && \
     make install && \
     cd / && \
     rm -rf /usr/local/src/bitcoin
 
 RUN apt-get remove -y \
-    build-essential libtool autotools-dev automake pkg-config libssl-dev \
-    libevent-dev bsdmainutils libzmq3-dev \
-    libboost-system-dev libboost-filesystem-dev libboost-chrono-dev \
-    libboost-program-options-dev libboost-test-dev libboost-thread-dev \
-    libminiupnpc-dev git && \
+    build-essential libtool autotools-dev automake \
+    pkg-config bsdmainutils git && \
     apt-get autoremove -y && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 ENV HOME /var/lib/bitcoin