added gcc dependency to Dockerfiles

docker/ubuntu-dev/Dockerfile

@@ -8,6 +8,7 @@ RUN apt-get update && \
 	# add-apt-repository
 	software-properties-common \
 	curl \
+  gcc \
 	wget \ 
 	git \
 	# evmjit dependencies

docker/ubuntu-jit/Dockerfile

@@ -10,6 +10,7 @@ RUN apt-get update && \
 	curl \
 	wget \ 
 	git \
+  gcc \
 	# evmjit dependencies
 	zlib1g-dev \
 	libedit-dev

docker/ubuntu/Dockerfile

@@ -3,6 +3,7 @@ FROM ubuntu:14.04
 # install tools and dependencies
 RUN apt-get update && \
 	apt-get install -y \
+  gcc \
 	curl \
 	git \
 	# add-apt-repository