Add FIBERS_VERSION declaration. NPM to version 5.0.3.

Dockerfile

@@ -7,6 +7,7 @@ ARG METEOR_RELEASE
 ARG METEOR_EDGE
 ARG USE_EDGE
 ARG NPM_VERSION
+ARG FIBERS_VERSION
 ARG ARCHITECTURE
 ARG SRC_PATH
 
@@ -17,7 +18,7 @@ ENV NODE_VERSION ${NODE_VERSION:-v4.8.1}
 ENV METEOR_RELEASE ${METEOR_RELEASE:-1.4.4.1}
 ENV USE_EDGE ${USE_EDGE:-false}
 ENV METEOR_EDGE ${METEOR_EDGE:-1.5-beta.17}
-ENV NPM_VERSION ${NPM_VERSION:-4.6.1}
+ENV NPM_VERSION ${NPM_VERSION:-5.0.3}
 ENV FIBERS_VERSION ${FIBERS_VERSION:-1.0.15}
 ENV ARCHITECTURE ${ARCHITECTURE:-linux-x64}
 ENV SRC_PATH ${SRC_PATH:-./}