Add git and mercurial as dependencies

checkdeps.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+echo -n "Checking dependencies for Minio.. "
+
+## Check all dependencies are present
+MISSING=""
+
+env git --version > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+  MISSING="${MISSING} git"
+fi
+
+env hg --version > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+    MISSING="${MISSING} mercurial"
+fi
+
+env gcc --version > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+    MISSING="${MISSING} build-essential"
+fi
+
+## If dependencies are missing, warn the user and abort
+if [ "x${MISSING}" != "x" ]; then
+  echo "ERROR"
+  echo
+  echo "The following build tools are missing:"
+  echo
+  echo "** ${MISSING} **"
+  echo
+  echo "Please install them "
+  echo "$ sudo apt-get install ${MISSING}"
+  echo
+  exit 1
+fi
+echo "SUCCESS"