Merge branch 'develop' into master

all_tests.sh

@@ -7,22 +7,6 @@ assert sys.version_info[0:2] >= (3,5), \
 """Please make sure you are using Python 3.5 or later.
 You ran with {}""".format(sys.version)' || exit $?
 
-echo "Checking solc version..."
-out=$(solc --version) || {
-    echo 2>&1 "Please make sure you have solc installed, version 0.4.21 or greater"
-
-    }
-case $out in
-    *Version:\ 0.4.2[1-9]* )
-	echo $out
-	;;
-    * )
-	echo $out
-	echo "Please make sure your solc version is at least 0.4.21"
-	exit 1
-	;;
-esac
-
 echo "Checking that truffle is installed..."
 if ! which truffle ; then
     echo "Please make sure you have etherum truffle installed (npm install -g truffle)"