Update Dockerfile maintainer and npm version.

Dockerfile

@@ -1,5 +1,5 @@
 FROM debian:wheezy
-MAINTAINER wefork
+MAINTAINER wekan
 
 # Declare Arguments
 ARG NODE_VERSION
@@ -13,7 +13,7 @@ ENV BUILD_DEPS="wget curl bzip2 build-essential python git ca-certificates"
 ENV GOSU_VERSION=1.10
 ENV NODE_VERSION ${NODE_VERSION:-v0.10.48}
 ENV METEOR_RELEASE ${METEOR_RELEASE:-1.3.5.1}
-ENV NPM_VERSION ${NPM_VERSION:-3.10.10}
+ENV NPM_VERSION ${NPM_VERSION:-4.2.0}
 ENV ARCHITECTURE ${ARCHITECTURE:-linux-x64}
 ENV SRC_PATH ${SRC_PATH:-./}